My dad bought a 94 1/2 crew cab long bed 4x4 5 spd brand new back in the day and his camper would "overload it" so he put duals on it himself. Quite expensive, had to buy new fiberglass fenders, 6 new wheels for a dually and then 6 new tires! He did the work and paint himself for cheap. Whole thing cost about 4 grand and was well worth it!