I recently pulled up the rear carpet in my 1995 Jeep Cherokee Sport to get access to a set of stripped & snapped shock bolts and mountings (whole other post!). What I found was a soaked carpet and three penny-sized holes, strait in a line, where water was deflecting off the muffler and a support beam. A smiliar set would have formed in a parallel to line to these holes had it not been for the support on the passenger side being in contact with the bed. The metal on top of that strut had not rusted through completely and looked like a skin boil.
It looks like when they undercoated, these areas were out of the line-of-sight of the nosle and did not recieve a good coating, if any at all. If that isn't the case, I can see how the water would have over time worn away at those specific areas.
Wired brushed the rust off, fiberglassed, primed, and painted all the rust spots I could find(very minor)--but the question remains, where else will the rust be? Has anyone else noticed a pattern of rust in the 1995 sports?
The next project is to do the front half...