I just went out and measured between my bed and cab of my '63 GMC 4000. There's 3 inches between the cab and bed. I had my bed installed by a company that installs feed mixer beds for cattle feedlots. With the pivot point located at the end of the frame rails, the only concern they had was how much overhang I had BEYOND the frame rails. I have 4 ft overhanging the frame rails. With the hoist fully extended, the tail end of the bed just barely drags the ground. So if I'm spreading a load of dirt or sand, I don't raise the hoist fully, unless I'm stopped . The shop foreman warned me about loading my bed too heavily toward the front of the bed, saying that weight near the rear of the bed will "help" the hoist dump the load. Also keep in mind where you would locate a trailer hitch (if planning one). You might have to hang one from the frame rails of the bed, due to the overhang. I know this discussion is all about cab/bed measurements, just keep in mind the other end of the bed too. JP
