Troubleshooting Triple Axle Trailer with Rear Axle Off The Ground

Updated 04/26/2019 | Published 04/25/2019

Products Featured in This Question

Karrier KR03 ST175/80R13 Radial Trailer Tire - Load Range D

(2432)

$104.78

Triple-Axle Trailer Hanger Kit for Double-Eye Springs - 1-1/2" Front/Rear, 2-1/2" Center

(92)

$131.31

Question:

I recently purchased a triple axle shop built trailer. When sitting Level the rear axles do not touch the ground. I checks the shackles and they are not flipped but it’s just probably 3/4” off the ground. When I get up to around 50mph with the trailer empty I get some trailer sway which I assume is from there not being enough weight on the tongue. My thought was that the rear axle not being on the ground may have something to do with it. My thought was to go one size bigger 225/75r15 on the rear tires to alllow them to make contact with the ground. Is this a reasonable solution and if not do you have any suggestions?

asked by: Andrew C

Expert Reply:

It is definitely not recommended to add different size wheels to one of your axles on your triple axle trailer. There is likely a miscalculation in axle spacing that is causing that third axle to sit off the ground. That definitely is not ideal and needs to solved.

It is likely an equalizer, shackle strap, or hanger mismeasurement. Triple axle trailers do have different measurements than tandem axle trailers so you don't simply space the hangers out evenly. Based on your tire size, you most likely have 3500 or 4400 lbs axles. The Triple-Axle Trailer Hanger Kit for Double-Eye Springs - 1-1/2" Front/Rear, 2-1/2" Center # APTT3 and the corresponding measurements diagram I've attached may help. I've also attached an article on trailer suspension for more information and troubleshooting.

expert reply by: Jason S