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  1. #1
    Join Date
    Apr 2008
    Location
    BC, Canada
    Posts
    45

    Default Trailer Question

    I want to build a trailer for two quads. What I am wondering is which way should the deck stringers go? I am told that from the left side to the right side is the way to go (Pic1). I have been known to go overboard when building stuff, a common problem with steel burners I think, but to me running them length wise (Pic2) would give me a more rigid deck, keeping in mind the axle will be the fulcrum. The deck is going to be 10' by 5' with the axle 6" inches to the rear of center.

    Any help would be great, thanks.
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  2. #2
    Join Date
    Feb 2008
    Location
    North of Phila. PA
    Posts
    404

    Default

    Not quite sure how running the structure lengthwise would give you a stiffer deck myself. I'll assume (you know what they say about that), that your axels will mount to the outer rails. That being the case those members will determine the lengthwise stiffness. If they are the same on both designs they should bow about the same "in theory", regardless if the load transfers from the sides as in pict one (assuming the trailer's evenly loaded) or from the ends in pict 2. Cross stiffness would come from depth of the members and how they join to the load bearing rails. In this case I would think that pict 1 with more cross rails would give you a stiffer floor in twist. Almost every trailer/ truck bed I can think of uses a design like pict 1.

    Think about how you plan to deck a 5X10 trailer. If you use plywood you either need a 5'wide or 10' long sheet in pict 2. It's available but costly. Most landscape/equip. trailers I see use a design like pict 1. The cut down 4x8 sheets of ply or sheet steel, fall on a crossrail or the 2x's run length ways front to back and sit on all the cross rails.

    Good luck.

  3. #3
    Join Date
    Jan 2009
    Posts
    13

    Default

    What size are the quads no.one? Do you want to haul them side by side or one behind the other? How heavy gvwr are you looking for?

  4. #4
    Join Date
    Mar 2007
    Location
    Vero Beach, fl.
    Posts
    761

    Default

    The crossmembers must be placed from side to side to give the trailer any strength and rigidity. Running the crossmembers lengthwise will result in a very weak and unsafe trailer.
    If necessity is the Mother of Invention, I must be the Father of Desperation!

    John Blewett III 10-22-73 to 8-16-07
    Another racing great gone but not to be forgotten.http://video.google.com/videoplay?do...modified&hl=en

  5. #5
    Join Date
    Jan 2009
    Posts
    13

    Default

    I agree the best way is to have the cross members running side to side, but i have a 7 ton trailer with three longitudinal frame members and no cross members.

  6. #6
    Join Date
    Feb 2008
    Location
    Guam
    Posts
    177

    Default You need both

    You need both, also your deck needs to be securely attached for additional stiffness.

  7. #7
    Join Date
    Apr 2008
    Location
    BC, Canada
    Posts
    45

    Default Thanks guys

    Thanks for the information.
    Looks like from side to side is the winner. I didn't put them in the pics but I am going to weld in stiffeners between the stringers.

    Thanks again, when it's done I'll post pics.

  8. #8
    Join Date
    Sep 2006
    Location
    Abilene, Texas
    Posts
    639

    Default

    Listen to dabar39 when building trailers. He's built one or two.
    Jim

  9. #9

    Default

    Here's a link to my trailer project I did a couple years ago.
    Thought it might help you along with your project.
    http://www.millerwelds.com/resources...railer+project

    Good luck.
    Andy

  10. #10
    Join Date
    Jan 2007
    Location
    Rosetown, SK.
    Posts
    519

    Default

    Good to here from you Andy. How goes the schedule for race season for you.Bet that foreman you had on trailer project has grew a bit since then.
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