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Here is a statement from your trailer’s federal certification label.
“This vehicle conforms to all applicable U.S. Federal motor vehicle safety standards in effect on the date of manufacturer shown above. All weights are approximate.”
Here is another statement from a National Highway Traffic Safety Administration (NHTSA) Q&A document.
“The FMVSS have requirements for the manufacturer to use proper tires and rims for the gross axle weight rating (GAWR) and the gross vehicle weight rating (GVWR). The manufacturer may determine the GVWR by adding cargo capacity (if any) to the curb weight of the vehicle as manufactured. The wise consumer, before purchase, will determine if the vehicle has sufficient cargo capacity to carry the weight of water, additional equipment (such as televisions, and microwave ovens), and luggage. The manufacturer’s certification label must show the GVWR. The GVWR must not be exceeded by overloading the vehicle. There is little the government can do to assist a consumer who has purchased a vehicle that has insufficient cargo capacity for its intended use.”
Alterations to the vehicle certification label can only be performed by the vehicle manufacturer or someone having the authority (certified) to alter the vehicle. (See 49 CFR part 567 – certification).
The point for all of that is all about durability. Changing wheels/tires, axles, brakes, springs, etc. can all be considered increasing the vehicle’s load capacity reserves by the addition of items that provide more durability. Those items DO NOT increase the vehicle’s basic manufactured limitations such as GVWR or GAWR values.
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