What Is a Vehicle Class Code?

There are eight vehicle class codes. Class one is used for 1 to 2 axle passenger vehicles such as normal cars, vans or motorcycles. Class two is used for 3 to 5 axle vehicles such as trailers, single-wheel RVs and limousines. Class three is used for 5 to 9 axle trucks and tractor trailers. Classes 5 through 9 are used for vehicles with dual rear tires and large vehicles such as car carriers or buses.