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How to Select Axle for Fabricating Car Hauler Trailer with GVWR of 2200-lbs

Question:

I am in the planning stages for a single axle trailer to haul my vintage drag car. The car weighs 1880 lbs. I am trying to pick the right axle. Do torsion axles have a rated duty Cycle? Say no more than 75 of the rated capacity etc. ? I figured the car, trailer all loaded will have a gross weight of 2200 lbs. Should I step up to a 3500# axle? I dont want a super rigid ride, but I also dont want to shorten the life of the axle either. Thanks

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Expert Reply:

We do not sell torsion axles but they will carry a weight capacity rating just like leaf spring beam axles, which we do offer. A torsion axle can be used continuously up to its rated capacity so long as there is no deterioration to the rubber cords inside it. This can be tough to determine visually but if you can see ANY of the cord exposed (due to "torsion creep") then the axle is done and should be replaced.

For a trailer that will have a gross loaded weight of 2200-lbs you could use a 2200-lb-rated beam axle kit like # 20545I-EZ-60-15 or you could move up to the next rating of 3500-lbs. If you did not account for the weight of things like fuel in the car, extra filled gas cans, a tool box, etc, then I would go for the 3500-lb axle like # 35545I-EZ-89 with idler hubs or # e43SR with brakes. It is better to have a slightly stiffer ride than to risk overloading the suspension.

Since you are fabricating your car hauler you might want to consider an axle-less suspension system from Timbren that will bolt (or weld) onto your trailer frame - no axle beam required! This can provide both better ground clearance and a lower deck height for easier vehicle loading. Timbren offers various kits that you can see on the linked page. For instance, Timbren kit # ASR3500S04 is rated for 3500-lbs and has drop spindles which give you a lower deck height.

The Timbren Axle-Less suspension system may require additional support on your trailer. If your trailer does not have a crossmember above the spot where you want to install the Timbren system, you may need to reinforce the frame. You can accomplish this three ways. First, you can retrofit the trailer with a crossmember. Second, you can build out the trailer frame. Third, you can use standard, 2-inch steel tubing to connect the 2 Timbren suspensions together using the built-in square hole on each unit.

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