how do I repair a stripped out screw hole in the wall

On the thin wall of an RV, I'm not a fan of inserts... They never seem to hold well for me. Wing nuts aren't reusable.

Snap toggles, on the other hand...



They stay in place even if you remove the screw, so they're completely reusable as many times as necessary. At work, I have a 52" TV hung from a metal-stud drywall wall using just four of those snap-toggles. I've personally hung off the mount myself without an issue. I'd be more worried about the whole wall falling over than the TV coming off the wall.