Gvwr is a constant number. Whatever load you put on your trailer is up to you. A trailer that has a 2900# GVWR from the manufacturer ( not a negotiable number) is rated from the factory to be safe to carry up to 2900# total including weight of trailer. If you have a trailer that weighs 1,000# and you load it with 2500# of stuff, you are over the GVWR of that trailer as set by manufacturer. If you get into a accident, you might or might not get a ticket. It's not against the law to be overweight, if not commercial. But, you can darn well expect to get sued from whoever got hit.
You can have a trailer that weighs whatever weight you can think of. But if the GVWR as set from the manufacturer is over 3000, it legally has to be registered in WI.
Again, the reason why trailers in WI are rated at 2900 instead of 3500 is because of the trailer registration thing. The exact same trailer in IL will be rated at 3500.
Seems odd to me that a trailer manufacturer would know where trailers would be going to to be sold. Would also greatly complicate logistics. I guess for smaller local manufacturer it would be that they'd rate it for local registration weights. Also seems odd they would complicate things over why would they even care about people paying for plates in one state, and staying on top of registration laws for their entire sales area.
May be I don't know what I'm talking about?
Could it be that the dealers are able to Change the gvwr, my inter net search says yes.
Found this discussion forum that claims to quote info off of NHTSA website
Ok, I hear the weight police sirens coming, but I will preface this with....it is based on statute....Ok, here it goes....
The 49 CFR 573 regulation for GVWR only applies to newly manufactured vehicles. However, it does allow modifiers or alterers to change the GVWR using a good faith judgement on the new GVWR based on equipment installed such as brakes, axles, tires, etc.
Again no offense meant at all but GVWR can be adjusted.
This following paragraphs are straight from the NHTSA site:
The term GVWR is defined in 49 CFR 571.3 as "the value specified by the manufacturer as the loaded weight of a single vehicle." The GVWR informs vehicle owners how heavily the vehicle may be safely loaded. It also affects the vehicle's loading and other test conditions for the performance tests to ascertain whether the vehicle complies with applicable safety standards.
The only express regulatory limitation on the GVWR that manufacturers may assign to their vehicles is set forth in 49 CFR 567.4(g)(3), which provides that the assigned GVWR "shall not be less than the sum of the unloaded vehicle weight, rated cargo load, and 150 pounds times the vehicle's designated seating capacity." "Unloaded vehicle weight" is defined in 49 CFR 571.3 as "the weight of a vehicle with maximum capacity of all fluids necessary for operation of the vehicle, but without cargo, occupants, or accessories that are ordinarily removed from the vehicle when they are not in use." Although the term "rated cargo load" is not defined by regulation, generally it is the GVWR of the vehicle minus the combined weight of the occupied designated seating positions (150 pounds times the total number of designated seating positions) and the unloaded vehicle weight.
Alterers must also determine whether their modifications affect the manufacturer's stated GVWR, gross axle weight rating (GAWR), and vehicle type. If such a change has been made, the alterer must specify the new GVWR, GAWR, or vehicle type in a manner consistent with the capability of the vehicle to comply with applicable standards and operate at higher weight rating and/or as a different type of vehicle. NHTSA expects both manufacturers and alterers to assign GVWR and GAWRs that reflect the manufacturer's or alterer's good-faith evaluation of how the vehicle's braking, load bearing items (including tires), suspension, steering, and drive train components will react to the vehicle's weight, size, cargo-carrying capacity and intended use.