View Full Version : axle placement on trailer
06-23-2004, 11:29 PM
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.
06-24-2004, 08:10 AM
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.
06-24-2004, 06:42 PM
60% in front of the axle, 40% behind....unless its a tilt then it's just before the midline
06-24-2004, 06:44 PM
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.
06-26-2004, 10:51 AM
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.
06-28-2004, 03:18 PM
Here is some useful information;
Trailer Design tips (http://www.trailerplans.com/axle_placement_bumper.htm)
06-28-2004, 08:59 PM
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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