I have a 1995 F-350 dually, door sticker says GVRW is 4500kg I'm not overloaded on axle weight but am on gross weight according to door sticker usually around 4750kg gross. My registration in Ontario ...
I am in Clark Co, Nevada and they don't have commercial classification for pickups. I know Clark Co is different than rest of NV on several levels, so my experience might be different due that. Fact is that registration for F350 is not cheaper here, than what I paid in California.