1. Ivan Vujadinovic
    April 22, 2020 @ 7:57 AM

    How can you measure this if you have no way of knowing what the weight of the trailer is?
    Unfortunately, I can not haul a trailer I am building to a scale, without permanently mounting the axle first.
    Thank you!


    • Mechanic
      April 22, 2020 @ 10:20 AM

      Well, measuring or estimating weight is a pretty big part of finding weight proportions. You can do some tricks like setting up a lever system so you can weight portions using a bathroom scale. I does require more math and careful measurements. For instance, measuring the weight of one side of the trailer (then double it) can give a good estimate. Good luck.


  2. Matt
    December 21, 2020 @ 10:38 PM


    I recently acquired a 4 x 10 utilty trailer that had a rotted wood structure that I ended up removing. Based on how it looks and was constructed, I would say it is old; what is funny about it, from my perspective, is the axle placement, as it is located dead center in the bed length. So I have a few questions please as I determine proper axle placement please:

    1.) I cannot load anything on it, obviously, because it is stripped down currently, but I believe I can still weigh it on a scale. Unloaded, are the weight readings still helpful for this determination?

    2.) If they are, and it appears that the axle is not placed correctly, my inclination would be to remove length from the rear to correct the problem, no more than two feet. Would the weight readings make it possible to figure this out with some degree of accuracy?

    3.) For the trailer reconstruction, I plan to add reinforcement metal to the frame along with a trailer tongue toolbox, which, inevitably, will increase the weight on the trailer, hence altering the calculations of the trailer empty. Obviously, this axle determination will need to be made before any reconstruction, so would these additional items (extra metal, trailer box, etc.), just need to be weighed separately and then added to the calculations?

    In the end, maybe I should just leave it as such, but since I am at this point, I’d rather set it up as well as possible, or just rehab as it is. Thank you in advance for your assistance.


    • Mechanic
      December 22, 2020 @ 10:01 AM

      That can be a fun project. 1) Once you have weights of the individual pieces, you can assign them a distance and make the calculations. Equations on the related page may be more useful https://mechanicalelements.com/trailer-axle-position/ 2) Estimate the load and adjust position as needed. The length of the back does not matter, it’s the weight balance. If you always load it to the front, you don’t need to cut the back. 3) See previous. If you load the trailer wrong, it will tell you by being squirrely down the road. Try this video as well https://mechanicalelements.com/video-trailers-tow-stable/ We talk a lot about theory, but reality shows the exact weight bias doesn’t bring the world crashing down. Be smart, do your best, and it will work.


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