I am looking a 1983 F600, 6.1L V8 that the city has for sale. It is a 12' flat bed dully wheel drive. Overall in good shape given the year. It has a GVW rating of 16,500 but I have been unable to find what would be the GCWR? I not sure what the truck weighs but it is pretty big and the deckover bed is made of 2 inch solid wood. Would like to pull a 20ft equipment trailer rated at 16,000LBs. Seem this truck would have to be able to handle 24,000 combined weight? Anyone have an idea of what were the axle rates for this model year or what this truck can pull legally?