Why is Axle Rated Higher than Utility Trailer on Certificate of Origin

Question:

I just purchased a utility trailer and the seller told me that the single axel was rated 3500 lbs, but the certificate of origin states 2990 on it. Is there a reason why it doesnt specify 3500 lbs if it actually is? They told me that they under rate the axel on the Origin of Certificate because at 3500 lbs they are required to have brakes in some states. Is this actually true or not? I live in Oklahoma if that helps.

asked by: John

Expert Reply:

There are a variety of reasons why there might be a 3,500 pound axle on a trailer that is only rated for 2,990 pounds on the certificate of origin. I am not familiar with manufacturers under-rating the capacity in order to bypass certain braking laws, but it's possible that while the axle is rated for a certain capacity, some other component(s) on the trailer are rated for less, such as the suspension. The weight capacity of the trailer is always going to be limited by its weakest component. If the trailer has a 3,500 pound axle but the suspension is rated for 2,990 pounds, the trailer is going to be limited by the suspension's capacity.

To verify the axle rating on your trailer, there should be a tag located on the axle itself that indicates its capacity, along with the part number and length. If you cannot locate this, you can also try measuring the axle diameter. A round, 2-3/8 inch diameter axle will typically have a 3,500 or 4,400 pound capacity

expert reply by: Chris R