Not to be a wiseguy, but, just about everything on a CJ can be a potential problem. I am sure many will chime in, but here are a few issues I have come across owning two '78 CJ7s.
Rust - everywhere; Frame Rust, Rot, Sagging; Electrical - previous owner's mangling; Typical mechanical problems. The list can go on and on.
Good luck in your search.
'78 CJ7, 304 W/EDELBROCK HEADS AND HOLLEY CARB, T-150, D300, CLEMSON ORANGE PAINTJOB.