Delaminated exterior skin or interior paneling (wall and ceiling) would eliminate further inspection if I were looking at it. Delaminated skin will appear as a largish bubble, easiest to spot while looking down the sides, but not so easy when looking straight at them. Easy to make a coach with this issue look good in pics. Either problem (inside or outside) are signs of water intrusion and a level of rot that often include mold. There is a distinct smell to these coaches that is difficult to mask.
If you can find no traces of water intrusion, then go ahead with your inspection. What you'll likely find is that half or more that you look at won't pass this first check...
Regarding repair of this issue, most find it more than what the coach is worth. It's the number one cause for scrapping an RV.
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake