Welcome to the forums. The "wrinkle" in th ebody is probaby delamination which is mostly caused by water intrusion. If the coach is the typical laminated construction, the Filon has a Luan plywood backer. When it gets wet, it will cause the sidewals to bulge or wrinkle.
Not much can be done to fix it. You need to fix all of the leaks...they only get worse.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Currently FOR SALE Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer