I have the same issue and I know for sure the mounts are not rotten. Recently I have sandblasted the frame and used new body mounts, still the alignement of the bed and cab is about 1/2" off.
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Yours is different than mine, the way mine does it it looks like the cab is level, but the top of the bed is at at an acute angle with the back of the cab. Like the ass is higher than the front, then the cab levels. So it's an inch wider gap at the bottom than at the top. I will have to take a pic when I get a chance. Looks like something heavy was put on top of the truck and bent it down.
*EDIT* Added Photo, Notice how the gap is smaller at the top of the bed, than at the bottom? It's even more noticeable from further back when you see the truck as a whole.
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