axle placement on trailer

Discussion in 'Trucks and Trailers' started by muddstopper, Jun 23, 2004.

  1. muddstopper

    muddstopper LawnSite Silver Member
    Posts: 2,342

    I am building a new trailer to haul my equipment. I currently have a 16 ft that is just a little too short so instead of trying to modifly it I decided to build a 18 ft'er. My question is how far back from the tongue do you place the axles so it will pull right and have good weight distribution. I will be using two 3500lb axles with brakes and springs. There should be a formula for figureing the axle placement but I havent been able to find it.
     
  2. CT18fireman

    CT18fireman LawnSite Senior Member
    Posts: 611

    For a landscape or general hauler usually about 2/3 of the length of the trailer. For a boat trailer it is more like 3/4.
     
  3. Carolina Cutter

    Carolina Cutter LawnSite Senior Member
    Posts: 987

    60% in front of the axle, 40% behind....unless its a tilt then it's just before the midline
     
  4. Carolina Cutter

    Carolina Cutter LawnSite Senior Member
    Posts: 987

    If you are going to use two axles you need to use a equalizer. It should be placed at the 60% mark and then mount the axle and springs based on that.
     
  5. muddstopper

    muddstopper LawnSite Silver Member
    Posts: 2,342

    Thanks guys, That 60%, is that counting the tounge or just the trailer bed? Tongue will be around 4 ft long. I am guessing 60% of the bed and not including the tongue.
     
  6. Loganwildman

    Loganwildman LawnSite Member
    Posts: 60

  7. muddstopper

    muddstopper LawnSite Silver Member
    Posts: 2,342

    Great helpful site.
    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. The extra tongue weight should make the trailer pull a little better when only loaded with half loads. or when leaving the lite attachments loaded on the front of the trailer which I usually do.

    Great help Guys!!!
     

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