Will Trailer Axle Replacement Allow for Increased Trailer Weight Capacity  

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Expert Reply:

We do offer 3500-lb-rated beam axles, including axle kits that have hubs and brakes, like # 35545E-ST-89. But above that axle rating shipping size/weight restrictions mean that a beam axle for 5200-lbs cannot be shipped. In this case we offer the Timbren axle-less trailer suspension kits like # ASR5200S01. Our main page for trailer axles is linked for you. By the way, we do offer 5300-lb-rated leaf spring # SP-222275 which is 24-7/8-inches long eye-to-eye.

Please note that changing your axles from 3500-lbs to 5200-lbs does not necessarily increase the trailer's weight carrying capacity. A trailer's GVWR, which is the most it can weigh under any circumstances, is based on more than just the axle rating. The axle is just one component in the mix. GVWR includes the individual capacities of the trailer frame, the axles, the suspension, the hubs, wheels and tires.

If you knew, absolutely and positively, that the weakest link in the trailer's overall design was the axles, then increasing axle capacity could result in a higher weight capacity for the trailer. But this is a determination that has to be made by someone with an engineering background and experience with trailer design. You might contact the trailer maker with the unit's VIN to ask if the axles upgrade is advisable or not. It is conceivable that the same trailer frame could have been used on different trailer models that use these two differently-rated axles. But this is not something you want to assume. The manufacturer may tell you that the frame is the weak link and that it cannot support more weight.

expert reply by: Adam R

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