One thing that was important then and maybe now is a true 8' x 4' bed on the 3600 model.
That depends on what year 3600. Up to mid 1957, the 3600 had a 7 1/2 foot bed, as did the '55-mid'57 3200, which is basically a 3600 with 3100 axles, wheels, and brake drums/shoes.
