I think there should be a thread dedicated just to known body rust issues. In the northeast, 80 and 100 series are prone to rotting out at the rear quarter panels where the bumper corner attaches to the wheel well. In addition, the rearmost side of the rocker eventually dissolves away from being clogged with sunroof water. In the original post you can see how bad the core support body mount rusts too. I have also seen them develop gaping holes in the fender apron under the air cleaner.
