When I had a truck with a slide-in camper it was considered by the California DMV to be a commercial vehicle as the camper was not welded permanently to the bed of the truck.
Unless your truck is improperly loaded, as in overloaded for the suspension, the CHP is going to ignore you completely. If there is a lot of sway or you move around in the lane or fail to drive at a steady speed, then you will be noticed.
As long as the GCWR is not exceeded with your load you will be legal and if in doubt pay the $15 to have the loaded vehicle weighed at a local CAT scale.
