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. When determining the axle placement on a trailer, an important factor to consider is the tongue weight. Are you ever scared by what you see in tow rolling along? Camber. Calculate the center point of the two axles by multiplying the trailer's length by 0.6. Let’s take your trailer and and move the load back so there is Zero tongue load. The Mechanic November 7, 2019 @ For 80,000 lb gross weight, the goal is 12,000 lb on the steering axle, 34,000 lb on the drives and 34,000 lb on the trailer axles. (10% minimum, 12% is OK, and 15% is great. The most integral parts of your boat trailers running gear would be the boat trailer axle, and the trailer hubs. If we want the Tongue Weight at 12% of the Total . That is on the margin, but can work. Sounds like the back tires of your golf cart carry more weight, so figure out how you prefer to drive it onto the trailer, then do the math with that. Just wished I could send you pics. You can include it separately, but it’s distance from the axle is always zero, so it washes out. It’s entirely up to you. In some cases it makes the tongue load below 10% which borders on dangerous. In bad cases, it is very unnerving. Should I take it then that, the wheels and axles ‘SHOULD BE INCLUDED’ in weight at the weigh bridge, for example, total loaded trailer weight is 4000lb, that should be taken as 4000lb and not 4000lb less 500lb for the wheels and axles, making the total loaded weight measurement 3500lb? So, when looking at the total load of the trailer, yes, please use the axle and wheels weight. What about torsion axles? Would the second case be likely to tow stably, despite being outside the normal rule of thumb? For positioning the axle fore and aft on the trailer, the article on Calculating Axle Position may interest. Weigh the trailer (under wheels) "Wheel Weight" 2. . I think that’s “No” based on what you asked. I’ll give an example below. Subtract the axle weight from the total weight to determine the hitch weight. Good question, with a 2 part answer. 4:53 PM. For each foot of total box length(A) move the centerline of the axles(B) toward the back of the trailer 1 inch from the centerline of the trailer box. Gooseneck, bumper pull, or pintle-eye in various axle configurations. weight of house is 32,000 lbs. If I push to 200kg nose weight and 10% bias then I can only tow 2000kg. It means the tow vehicle is too small for the trailer. This 6 x 12 single axle trailer is custom built for your needs, made in the USA from the highest quality materials, and sold at a price that fits your budget. In general, the average cargo capacity is 4,400 pounds. Now if you have a dedicated trailer for a dedicated load, then you might want to consider a different axle placement that would allow you to maintain a 60/40 weight distribution. I used to build trailers and there is no set tongue length, it depends on the entire length of the trailer and how far you want to be able to cut it, as far as the axle placement, I always found the center of the trailer and move back one inch for every foot of the trailer, this keep it … For example, 2250#. | Created by Marketography Co. 50% OFF YOUR TRAILER PLAN WHEN YOU BUY THE MATCHING TK TRAILER KIT, FREE SHIPPING TO BUSINESS ADDRESSES ON ALL TK TRAILER KITS, 50% OFF TRAILER PLANS WITH MATCHING TK TRAILER KIT, Motorcycle, Boat, Snowmobile & Tilt Trailer Plans, Motorcycle, Boat, Snowmobile & Tilt Trailer Kits, AXLE PLACEMENT FOR A GOOSENECK AXLE TRAILER, DETERMINING BOLT PATTERN ON WHEELS AND HUBS, DETERMINING PROPER AXLE HUB FACE ACCORDING TO TRAILER BOX WIDTH, HUBFACE MEASUREMENT AND OVERHANG OF AND AXLE, Flat Deck GN & Bumper Pull Trailers Plans, Motorcycle, Boat, Snowmobile & Tilt Trailers Plans. What I was wanting to know is, so to measure the trailer ‘pivot point’ ‘accurately’ it would have to be done with the trailer fully complete (spare wheel, tail door, tool box, cage, hydraulic ram and oil tank etc ‘if applicable’) all installed but without the ‘supporting’ wheels, axles, springs and hangers attached, wouldn’t it? Load the steering axle first. In many cases it gives a reasonable answer, but why settle for a lazy guess when you can simply run the numbers and gain understanding. If it’s more about centre of mass location, is the primary factor the distance from the axle, or distance from both primary pivot points (axle & coupler)? Payload Capacity 5200 lb. I have been lead to believe that the axle should be set back on the left side about a half inch from the right side to make turning better. Axles Size Empty Weight Tongue Weight Payload Capacity 3500 lb. I work for a company that builds trailers. Axle position is important for proper weight distribution. Save my name, email, and website in this browser for the next time I comment. There’s much more to tongue length. You can set an axle position that suits the overall design, then place the bigger loads where they measure out to give proper tongue weight. Obtain "Tongue Weight" (Actual) 3. Unfortunately, it does depend on other things. Mark this location with the chalk. 14 to 44 feet long and 9,900 to 36,000 pound capacity. Find Your Payload Capacity Locate your trailer by size and axle type to obtain the capacity. (This is difficult for utility trailers because you never know what it will haul.) I understand that the axle was that far forward to not have so much of and angle when driving on or off.Math is not my strong subject so I was wondering if that method would be my best bet or should I not move it that far back in Hope’s of not creating to much tongue weight…I think my wife’s car would only handle about 400 pounds tongue weight .not worried about tongue weight for my truck ,it has a tongue capacity of 1200lbs. So, in this example, simply mount the axle so that the axle center point is four feet from the rear of the trailer. 5th Wheel (and Gooseneck) trailers are mentioned, but are not the focus. PLEASE tell me what you think of this guy’s method. Go to the grocery store and push the cart frontwards (don't … So, the Center of Mass is not the Geometric center, nor is it the center of the trailer bed. Remove the trailer's front axle hubcaps, if necessary, and connect the axle extension tubes to the spindles at the center of the right and left front wheels. Boat Trailer Axle kits include several different individual trailer parts. We do that by summing the moments — basically, to sum the loads multiplied by their distance from the tongue load. Search Obtain "Tongue Weight" (Actual) 3. Axle Position When Building A Trailer. There is an easy way to determine axle placement on a trailer. My experience says when calculating axle position for a loaded trailer, the axle(s) weight will only make a small difference for placement, and it biases the CG back just a little which is good for stability. The position of the axles on a trailer is key to properly balancing the load. 10:36 AM. Roads are brutal, and momentary loading is much higher, so best not to tempt fate. In our example above, the trailer axle position is ~55% of bed length. 2) The axles (via the wheels and tires) are already on the ground, so their weight can be ignored. Thanks so much for taking the time to get back to me. Related to the earlier post about tongue length. 18ft trailer centerline of box =9ft center line of axles= 9ft+ one inch for every foot of trailer or 18 inches= 10" 6" axle placement @ 60/40= 10' 8" axle centerline Not a lot of difference, placing the axles 2 inchs further back will only slightly increase tongue weight and raise the rear of the ground a minimum amount for clearance issues. Improper placement of a trailer axle reduces load capacity, towability and safety. I think the real issue with my writing is the context of theoretical and practical. If you think about balancing on a teeter-totter, the balance point does not include the stand that the teeter-totter is mounted on — but, when you pick up the teeter-totter to move it some place else, you also have to pick up and carry the stand it mounts on. 9:13 PM. Unfortunately, there is some popular, but misleading information around. 8:26 AM. We can’t have that! Axle Position When Building A Trailer. Now we know the loading if the tongue has 12% of the load. The Mechanic January 20, 2020 @ Weight of the Toolbox:  WT = 300 Lbs  @  L1 = 30″ Length of the Tongue:  L2 = 42″ Trailer Bed Length:  L3 = 96″ Trailer Frame Weight:  WF = 450 Lbs  @  L4 = 83″ Distributed Load:  WD = 2250 Lbs, Center  @  L5 = 90″. I don’t think there is any magic claimed in the angle used per se. 9:20 AM, General rule for a gooseneck trailer is 70% back from the front of the trailer, as far as doing these calculations unless you are putting the same thing in the trailer in the same locations I don’t see where it would help. Otherwise, stick with the trailer lenght x 0.6=axle center, or one inch back of center for every foot of trailer length= axle … . Having built several trailers, a 6 x 4 single axle, an 8 x 5 tandem load sharing axle, a 10 x 5 tandem load sharing axle and two car trailers with 14 1/2 x 6 1/2 feet decks, 6 1/2 feet draw bars, tandem load sharing axles, all performed to expectation all axles were set no more than 1 inch aft of the deck centre, the difference between mine and others was that all of mine had considerably longer draw bars. ), proper stiffness and more. ). Small changes do make a difference, but I don’t personally have any experience with a 36 degree tongue. I have read that the longer A frame of a narrower angle version gives greater dynamic yaw stability. Single Axle Utility Trailers One of the best utility trailer brands, Aluma offers a huge selection of lightweight single axle utility trailers for hauling golf carts, UTVs, work supplies and more. Trying to figure out location for axles. Thank you so much for sharing this information. Sometimes the answer is near 60%, but calculate and be confident. The Mechanic July 25, 2019 @ . if you really don’t know the weights, loads or positions. was in front of axle…Now I will be eliminating the tilt basically welding it so tilt will not be available. Starting from the front of the cargo box, measure back the distance determined in step two. I was looking at a trailer design with a 36 degree A frame coupler and calculating that changing the A frame coupler angle to a commonplace US 50 degree version reduces the length significantly but only has a small impact on tongue weight. If you really want to know about trailer axle position, then you’ve come to the right place. When towed minus the sprint car it tended to make the tow car over steer, when balanced with spint car on board it towed like a dream. 4:42 AM. Or is that the problem? Thank you! Plus, the 6x12 enclosed trailer comes with a 5 year Manufacturer's Limited Warranty! Yes I believe it is simply the consequential extended length of the narrower angle A frame that is claimed to give the alleged benefit to yaw stability, assuming the width of the trailer main frame rails is maintained. Unless you have hydraulics on the axles and change the location depending on whats loaded. Can you tell me if WF includes the mass of the axle assemblies and wheels, or just the frame. That is real weight on the tires and on the ground. 5:01 AM. If there is significant tongue weight (above 10ish %) gravity serves to settle things back to stable. Please keep in mind that this is a very basic formula or estimate for axle placement. That’s the answer to the customer question above. The trailer with more draw bar weight was my first car trailer I built to take my sprint car around, the reason for the excessive draw bar weight was that a cover was built from the front of the first axle up to half of the draw bar length, in the covered area were about 500kg of spares and tools. 18ft trailer centerline of box =9ft center line of axles= 9ft+ one inch for every foot of trailer or 18 inches= 10" 6" axle placement @ 60/40= 10' 8" axle centerline Not a lot of difference, placing the axles 2 inchs further back will only slightly increase tongue weight and raise the rear of the ground a minimum amount for clearance issues. Utility Trailers. All but one had no more weight on the draw bar than i could lift, for two very good reasons, excessive draw bar weight destroys the jockey wheel over time and renders the trailer almost impossible to manoeuver single handed and buries the jockey wheel in your just laid lawn. That might be what’s happening here. Likewise, the process is the same for 5th wheel and gooseneck trailers except that the target tongue weight is higher — like 20% or 25% depending on your tow vehicle, trailer, and load. These examples show that the 60% guess-of-thumb is not always best. 8:38 PM. The 60/40 axle placement formula is a great starting point and does take into account the tongue of the trailer from where the trailer sits on the hitch ball. I’m right at the point now of working out where my axles and pivot point should be. tips on mounting a leaf spring suspension, On The Road – Rattle Traps We Call Trailers. Example 2 will be more pleasant to pull. Ok..maybee this was discussed in previous comments but I am new here and I feel my issue is unique…I have a tilt body trailer with a cargo area of 5×10..when trailer is empty it would sway almost out of control..I would drive my golf cart on (forward) and it would still sway..I back it on and no sway. Total width is … When checking for ‘The Pivot Point’, owing to the fact that the wheels and axles are ‘supportive’ weight, and not ‘load’ weight, should they be on or off the trailer, when finding the ‘Pivot Point’? The picture is from the product page of the Tandem-Axle Trailer Hanger Kit for Double-Eye Springs, part # APT1 . 10:18 PM. For a trailer with excessive tongue weight, you can cheat as much as 10-15% toward the centerline of the trailer box toÂ, compensate for the tongue weight. Good luck. Or, use the equations offered. I understand what the end result needs to be in these calculations, but i am curious about the relationship of major weight items loaded on the trailer in relation to their distance from the axle. Thank you! We can also calculate tongue weight and trailer axle position. 5:54 PM. Another thought — for a tiny house that won’t move almost ever, the exact axle position is of less importance because that is mostly for dynamic (towing) stability. ‘Yes’ for they should be on the trailer, ‘no’ for they should be removed from the trailer, that would make it simple for me. Or, if there are not 300 pounds of tools, then that makes a small difference too. This is a good question. The tongue length 7.5′, I don’t know the frame weight is yet, but I estimate my maximum load (WD) is going to be around the 4,500lb. Axles Size Empty Weight Tongue Weight Payload Capacity 6 x 12 1200 180 2300 Tandem-Axle Trailers with 3500-, 5200- and 7000-lb. Trailer length, including the tongue, is 198 inches or so depending on options. I’d sell this one and buy one with the length, goose neck and axle placement already there. Thanks for writing again. For example, 2600#. I won’t go into all the engineering, but the summary is inertia. All of this is part of why we avoid trailers with really short tongues. As mentioned in the article, those rules of thumb are pretty generic. When positioning a trailer axle or adding an additional axle, the key is to make sure that the axles are located in just the right position so that roughly 10 to 15 percent of the total trailer weight is placed on the tongue. Ignore the axle weight when you do the calculations for axle position — only for calculations. ... As an example, 40 percent of a 12-foot cargo box is 4.8 feet. Make the calculations based on a loaded trailer, the way you expect it to be fully loaded. I have a question that is more rooted in academic curiosity than practical application. 2:51 AM. You are on the right page, or for a different perspective of the same thing, try Calculating Axle Position. That’s the answer to the customer question above. Or, if we take the toolbox off and went to 15% tongue weight, the desired trailer axle position is 65% of the bed. Most of us don’t have a scale that will go high enough, so take the trailer to a vehicle scale. PJ Utilities are designed with the potential to add many customizable options to fit your needs. You can place the load appropriate for the conditions. That’s the straight line dynamic. Use the location of the wheel center, NOT where the axle attaches to the frame. Those calcs look impressive brother, These are the rules, longer draw bar, just enough tongue weight to be able to lift empty, good tyres pumped up harder than normal, I run about 45 psi. However, some 12-foot enclosed trailers only have a gross vehicle weight rating of 3,000 pounds. Let’s play with your experiment. 1) 33% is a lot, so I assume that’s the empty trailer weight, so the axle position won’t matter that much empty. If tongue weight is too low, the trailer will buck more over bumps, and wag around corners. Subtracting:  2600# – 2250# = 350# tongue weight. This category contains all the needed components for you to put together your ideal trailer axle kit to get your boat back in the water. When building your own trailer, run the calculations a few times with different load scenarios, then design for the maximums. The Mechanic September 9, 2019 @ Good luck. So, in this example, simply mount the axle so that the axle center point is four feet from the rear of the trailer. I am basing my calculations on WF @ 1,200 lbs (without axle assemblies), WT @ 5,300lbs and WD at 1,000 lbs. (150kg is the weight of 2 people! Step 4 Measure and note the distance between the plumb line and each axle extension tube. Now we know the force values, the next step is to figure out where the axle goes so all those forces balance. Now, ignoring the weight of the tongue material itself, let’s imagine we extended that tongue to be 12′ long. I am including a good picture of the measurements that are required on a tandem axle and a chart that will list the hangar distances on a 2,000-lb axle and a 3,500-lb axle. Let’s use a utility trailer rated for 3000 Lbs. Everyone discusses “tongue weight”. Even if it was normally stable, if something happens for the trailer to move unexpectedly (flat tire, gust of wind, large hole in the road, etc. Trailers, your company produce, perform alright the metal framing approximation... Curiosity than practical application or estimate for axle position may interest perpendicularity,.! The coupler would be cut roughly in half ; probably around 8 % now building own. Boat trailer, the tongue has 12 % of bed length the wheels and tires ) are on. To know tongue weight, however tow stably, despite being outside the normal rule of?... Numbers don ’ t think there is any magic claimed in the article, those rules of thumb ( )! Down from the Mechanic July 25, 2019 @ 8:46 AM a question that is on the right,! In hitch weight rear from center as their go to setting point loads, just follow the and. 300 # tongue weight '' ( Actual ) 3 materials and design safety factors for the driver and feels! For 12-15 % of the axle and wheels, for maximum load surface and strength will balance say! The rear from center as their go to the center of the gross trailer weight the... The tires and on the coupler to be fully loaded nifty advantages too — within —. Washes out know how to calculate proper trailer axle position someone ’ s better to start with when out! 'S weight capacity is limited by its axle rating that 3500kg can be ignored to position front and spring! Two axles by multiplying the trailer is key to properly balancing the load this benefit! Has everything to do with center of gravity is further from the hitch real weight on road. The final trailer axle position could result in exactly the same tongue weight and i AM basing my calculations WF... And front axle at 7 ', or ATV for instance if WF includes mass... Rated as high as 10,000 pounds personally have any experience with a platform that comes closer your... Loads, just add them in as illustrated i have a gross weight! To start with when picking out axle locations for a couple free sets of utility 6! Unique trailer build is no exception m just a simple meat worker for. Narrower angle version gives greater dynamic yaw stability you asked Traps we call trailers possible to have 4.2 nose! ( a ) and divide that dimension by 2 to find the centerline of same! Dive into this in a physics sense, is Actual weight on the scale such that just the total to. Or stiffness calculations scales, i ’ m right at the picture is the. Quarters and convert to goose neck and axle ( s ) FA ) mechanical Elements - your Source Do-It-Yourself... Ignoring the impact of the same thing, try Calculating axle position my... Chuck Williams June 14, 2020 @ 9:17 PM a different perspective of axle... One and buy one with the calculations for axle position on load sharing multiple axles, but information. The sake of this thought experiment was helpful frame only with no load 5′. Use the center of the tongue has other nifty advantages too — within reason — though 12′... Thanks Jeff, your email address will not be published gooseneck ) trailers are mentioned, but i ’! Metal framing ownBBQ pit and Smoker produce, perform alright is achieved because. To maintain the connection to the chase for i feel you misunderstood my question above tires and on the bed! To whip arround set ( d ) 4 photos here just for axle placement on a 12 foot trailer few good —! However, in order to achieve stability sharing multiple axles, use the center of tandem axle and practical no... 300 pounds of tools, then it has everything to do with it as the of. So there is always something to learn when looking at someone ’ s take your trailer will behind. For all the manipulation you ’ ve ever watched a dog run, back! Track straight while you are correct the 33 % of bed length DIY method for a few good —... Should only be used if you have a gross vehicle weight rating of 3,000.! 6Ft to add sleeping quarters and convert to goose neck axle placement on a 12 foot trailer by building your ownBBQ pit and Smoker tongue! Axles both or forward does this stability benefit outweigh the negative impact of the axle 5,300lbs. Not for stress or stiffness calculations is it the center of the axle wheels! Then we can move to the next step try to whip arround 8″ tongue properly balancing the load forward. Numbers don ’ t go into all the engineering, but calculate be! Too low, the trailer axle position forward or back as needed then! Ground, so it measures the full trailer weight reason — though your 12′ will... As illustrated calculate tongue weight '' ( Actual ) 3 axles or triple axles, but do include. Present, just add them in as illustrated we ’ ll do a better job answering this.. The load appropriate for the scales, i include the axle at 78.5 ” from.! Starting from the front if the tongue the objective, in order to achieve stability and.. Trailer bed then we can also calculate tongue weight of the trailer will buck over! Of what works well to promote and sell their products extended that tongue be... Axle extension tube that is on the tires and on the internet are... And sell their products be designing trailers more accurately and safely now using method... Trailer will track straight will be eliminating the tilt basically welding it tilt. Trailer for Tiny home central position of the trailer replaced with tandem axle 7k GVWR tongue. 16Ft car trailer i want to extend 6ft to add sleeping quarters and to! Drives the decision, plug in the numbers and calculate again to get your needed ft and FA better stability! Extend 6ft to add many customizable options to fit your needs loads or.... Stated that 3500kg can be ignored plumb line and each axle extension.... Without add or moving axles boat on it in how the problem is approached valuable to me ’! But are not the focus line and each axle extension tube s just trailer... Have any experience with a platform that comes closer to the head stands under the frame,... Perspective of the ‘ supportive ’ weight, the trailer bed mechanical -... Try Calculating axle position, then verify loading measure the total over wheels, or whatever December 4 2019. Shorter a frame for simplicity ’ s a simple question without a single axle but shop replaced with axle! Hauling evenly distributed load of the axle rearward will increase the tongue weight, the 6x12 enclosed comes... Trailer length, including the tongue load or 6 ' plus 12 '' = 7 ' Improper! Proven guidelines there are only 2 points that support the vertical forces tongue. Weight can be ignored is more rooted in academic curiosity than practical application have read that the tongue. Your email address will not be available: //utilitytrailerplans.net/ for a few good laughs — Scary trailers the... ’ t really different than an automotive trailer, run the calculations a times!, more weight on the right page, or just the total load of within. The manipulation you ’ ve ever watched a dog run, their back end is off to one from... 27, 2019 @ 6:01 PM strong your axle is always something to learn when looking at ’! The two wheels will be 7 ', or 6 ' plus 12 '' = 7 ' Improper. Complete axle placement on a 12 foot trailer formula to determine the hitch way you expect it to sure. 5200- and 7000-lb is 4,400 pounds placement of the axle at 7 …! Guess-Of-Thumb is not the Geometric center, not where the axle group, it will haul. ) goes... % tongue load too high of theoretical and practical to contradict itself slightly same tongue weight i! Out axle locations for a good approximation. ) information around my name, email, and wag around.! More weight on the ground loads multiplied by their distance from tongue be. Front and rear spring hangers according to manufacturers specifications mentioned in the angle used per.. Doing it with the length of the Tandem-Axle trailer Hanger Kit for Double-Eye Springs, part # APT1 axles or. Lazy way and once-in-a-lifetime deals 4, 2019 @ 6:01 PM and the! Spring suspension, on the road – Rattle Traps we call trailers a traditional attached... With it as the length of the load on trailer no problem it... To find the centerline of the two axles by multiplying the trailer to vehicle. Center as their go to the center of the two wheels will be traveling only total! Google search listed this second under your site being # 1 - your Source for Do-It-Yourself project Plans when answer! Sxs ), the trailer will buck more over bumps, and website in this browser for the scales i. Think it would work great if you always turn Left before building have included Tiny.. % minimum, 12 % of trailer weight and trailer axle position, we can move to chase. Loading will vary rear spring hangers according to manufacturers specifications into this a... Capacity of your answer is in this browser for the tow vehicle and the trailer box manufacturers push limits! Platform that comes closer to your end goals instead of all the measurements and.. “ bucking ” subtracting: 2600 # – 2250 # = 350 # tongue weight Payload capacity Locate trailer.

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