Hi all, got some questions to do with GMC workshop bodies, I have noticed there seems to be two types. One has six windows on each side, the two rear doors are different sizes and has a straight edge to the bottom sides from front to back above the twin rear wheels. The other only has three windows each side, the two rear doors are the same size, a more curved roof, a recess for the twin rear wheels.
What is the intended use of both and as they are both the same size why two different body types ?