Well, I have to admit that I don't know how other states register vehicles and how they define vehicles.  In Maryland, the standard weight classes for trucks are as follows;
Under 7000 lbs costs $161 for 2 years.
7001 lbs to 10,000 lbs costs $214 for 2 years.
trucks from 10K to 18K cost $214, plus $9 per 1000 lbs over 10K for 2 years.
My Tundra had a GVWR of 7200 lbs.  I could either register it for 7000 lbs and "lose" 200 lbs of payload, nor I could register it for 10,000 lbs and "gain" 2800 lbs of payload.
I was registered for 10K lbs on my Tundra, and it came from the factory with E rated tires for a combined 12K lbs tire capacity.
Legally speaking, in any state in the union I was LEGAL to 10K lbs in my Tundra, even though the axle weights were rated to 8800 lbs and the door tag was rated to 7200 lbs.