The biggest issue you are going to have is fitting the camper in the bed. Truck beds were basically all the same size from the mid 1960's all the way until 1987. Then the manufacturers started messing with bed size, and haven't stopped. Every few years they change the size of the bed, making it deeper and narrower. Narrower both between the wheel wells, and at the tailgate opening.
Your 1968 camper is likely designed to fit in one of those boxy trucks with 16" high sides, ~52" between the wheel wells, and a wide square opening at the tailgate. It will need to be put on a platform to clear the 22"+ high sides on modern trucks, and the taller cab. It may need to be modified heavily to fit in the rear bed opening.