This truck should have Chevrolet axles rated at 15k each (if still original) with a GVW of 28,000 and a GVCW of 45,000.
All vehicles with over 26,001 GVW must have a CDL (Class A for trailers and Class B for straight jobs). Only fire fighters and farmers can drive Class A or B vehicle with a Non-Commercial Class A or B license. By law, all of the drivers of these big RV Coach's are also required to have Class B CDL with Air (if equiped).
Mike B
