Remco, my slightly newer F250 weighs 6800 pounds empty, and it is only a standard cab. The extra weight of the crew cab, plus the extra weight of the 2 tires and wheels, is going to push your truck dangerously close to the 7700 pound limit. The extra tires and wheels will weigh about 150 pounds, and the extra doors will be another 150, plus the seats, frame and sheet metal that make up the back half of the cab has to be another 300+ pounds. So we have 6800 + 150 + 150 + 300 = 7400 pounds not counting anyone but the driver. How strict is that limit? Do the police carry portable scales around to check weights?
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.