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Thread: Medium Duty Trailer Build - Discussion

  1. #1
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    Medium Duty Trailer Build - Discussion

    I am in the midst of commencing to build a trailer to pull a tractor recently acquired. It's a 1.7ishton Kioti CK20 series with a front end loader.

    It's going to be A-frame style hitch tandem axle. I'm also going to further reinforce it by welding in some tube along the outer edges - like a fence.

    I was thinking 4"x4" square tube for the frame and A frame style hitch.

    For the cross supports, and front 2 corner supports - 2"x2" square tube

    And for the upper fence - 1"x1" square tube

    Then treated wood planks for the floor of the trailer.

    The trailer itself will be 14' from floor edge to floor edge and 5'2" wide (axles dictating -each axle rated at 2.5tons)

    Anyways, this will be my first trailer built - the really rough paint diagrams (don't have photoshop installedyet) is really rough - just to get the design idea across - I based the whole concept on my own logic and what makes sense - that however is very relative so please chime in your opinions or concerns.



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    Looks like a light duty build to me - assuming tandem 3.5K axles?

    There is no need of all of that square tube for the main frame and A frame. 2 x 4 x .120 rectangular tube will work just fine. As for the x-members, 2" tube should be sufficient but if you have the deck loaded with heavy objects in the central sections of the deck, you may find 3" tall tubing preferable as it will provide considerably more support....but at only 62" wide, the 2" tube will likely be just fine.

    And be sure to move the axles farther forward. The idea with a tag trailer is to shoot for 10% of the GW on the hitch. A typical tag will have the axles 10 - 15% behind the center line of the frame (A frame not included). A heavier, stronger tow vehicle will tolerate higher tongue weights without negative affects, but still - do it right.
    Last edited by CTD NUT; 11-05-2009 at 03:25 PM.
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    Thanks brother. I just guessed as to what type of duty it would be....heh heck if I know

    Yea, I like the idea of the 2x4x.120 rect.tube - and I think I like the idea of 3" tube for the cross members - it will be just right when laying down the 1x4's for the floor.

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    No problem - should be a fun project. I would suggest 1 x 3 x .120 or 1.5 x 3 x .120 for the x-members. There is no need for anything larger - save yourself some weight and money.

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    You said 1x4 for the floor.....??
    I can't see a bunch of 3/4" thick planks being able to support a tractor.
    Some 2x lumber would likely be strong enough. Are the wood planks running front to back or side to side??

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    I actually have a trailer that I'm planning to do some surgery on.
    For a tandem axle, apprx. where on the deck would you lay out the axles?

    Currently the axles seem to be on either side of centre on the deck. I was going to cut the mounts off and re-weld them back on with the leading axle at centre. Currently the axle wants to wander like it's rear heavy.

    Thoughts? (sorry for hijack, but might help for axle placement)
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    Quote Originally Posted by The Guard View Post
    You said 1x4 for the floor.....??
    I can't see a bunch of 3/4" thick planks being able to support a tractor.
    Some 2x lumber would likely be strong enough. Are the wood planks running front to back or side to side??
    How many x-members he adds and deck loading will be what dictates minimum deck wood thickness. And the wood has to run front to back as the x-members run side to side.

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    Quote Originally Posted by }{avoc View Post
    I actually have a trailer that I'm planning to do some surgery on.
    For a tandem axle, apprx. where on the deck would you lay out the axles?

    Currently the axles seem to be on either side of centre on the deck. I was going to cut the mounts off and re-weld them back on with the leading axle at centre. Currently the axle wants to wander like it's rear heavy.

    Thoughts? (sorry for hijack, but might help for axle placement)
    Tandem axle dimensioning is based on the center line of the axles - the center of the tandem axle spring shackle yoke.

    Where the axles should be located on the deck is primarily based on the deck length. How long is it?

    What you are describing, is implying that the axles are centered on the deck - bad mojo. The trailer will be very sensitive to load weight distribution and will almost always be very light on the tongue.

    If the trailer axles themselves are actually wandering like you stated, you have a serious suspension problem.

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    Oh yeah, I suppose you could use 1x4 if you did put a bunch of "cross bars".
    I figured the wood needed to go front to back but just checking so I could understand.

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    Sorry I should have been more specific.

    When empty, the trailer wants to wander at speed (110+km/h, so I keep it under 100).
    When loaded (and ensured that there is tongue weight) the trailer is fine.

    Deck is 16', centerline of the axle spring shackle double mount (don't know what else to call it. The bracket in the middle that both springs mount to) is at 8'.

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    Quote Originally Posted by }{avoc View Post
    Sorry I should have been more specific.

    When empty, the trailer wants to wander at speed (110+km/h, so I keep it under 100).
    When loaded (and ensured that there is tongue weight) the trailer is fine.

    Deck is 16', centerline of the axle spring shackle double mount (don't know what else to call it. The bracket in the middle that both springs mount to) is at 8'.
    The thing in the middle of the tandems that the shackles attach to is called the shackle yoke which I referred to earlier. The fact that the axles are centered on the deck pretty much answers all of the questions about why the trailer tows like ass. On a 16' deck, pull them 20" back from center and you will be much happier. That trailer should be towing smooth and straight as fast as you are willing to go....loaded or not. If it doesn't something is very wrong.

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    Trailer

    Here's what I have built in the past.
    Last edited by rikker001; 12-23-2009 at 10:38 AM.

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    Why would build a trailer just for one machine? Make it a little bigger and use it as a general utility trailer.

    I bought a trailer to mainly haul my Jeep around, and I thought 18 feet was a bit much at the time. Its a flat deck, so I ended up using it to haul furniture around, cut down trees, building materials, a friends car, 4 quads at once. The extra size is very nice to have.

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    ^agreed. i have used my trailer for everything. Moving scrap, cars, Moving etc etc. my only issue is storing it because I don;t have room ere at my place I have to keep it somewhere else
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    Wasn't up to me. My old man wants it as big as it is. I wanted to make it bigger, but he wanted it as small as possible - and just for the tractor....don't ask...

    Then again, we have the trailers for moving scrap and other stuff etc. The only thing I can foresee this trailer not moving is another standard width vehicle. But for our purposes it'll work just fine.

    Picked up all the rectangular tubing today as well - $220 beans :-O

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