Dumb question dont get mad at me

Isn't there also several states that allow 40k on state roads?

 

Yes, I know TN allows a 74,000 lb gross on a 4 axle dumptruck on state roads.

 

Meanwhile in Alabama...
Vehicles Constructed for Special Types of Work: Dump trucks, dump trailers, concrete mixing trucks, fuel oil trucks, gasoline trucks, and trucks designated and constructed for special types work or use do not need to conform with the axle spacing requirements specified by the State bridge formula. These vehicles are limited to a weight of 20,000 lbs. per axle plus scale tolerances(10%), provided that the maximum gross weight does not exceed State limits(84k on 6 or more axles on state roads) and all axles are brake equipped (Ala. Code §32-9-20[a][4][e]).

 

Some states allow 36k on tandem asking as total gross weight bellow licensed 80k.