I'm not sure if I can describe this fix accurately, but I'll try. On our last trip in our 8315BSS a towel rack fell off of the bathroom door while enroute. The door, as you can imagine, is very thin material. I repaired the problem by replacing all of the screws with threaded inserts. These are inserted into the screw holes with a special tool that expands the back side of the insert. When the tool is removed it leaves a threaded screw hole in which you can insert a standard machine screw. This works essentially like a pop rivet except that it leaves a threaded hole. I purchased the threaded insert kit from Harbor Freight several months ago and never had occasion to use it until this week when I fixed the towel rack. i can't remember exactly but I believe the whole kit, with 4 different mandrels and an assortment of threaded inserts, was in the neighborhood of $20. I plan to use it frequently as I upgrade and repair various problems in my Rockwood.
BTW, back when I still owned my airplance, I believe that the mechanics refered to a similar fastener as a "riv-nut".
I hope this helps.
Rick (K8RWG), Joy, and Daffy (the spoiled Calico cat)
2014 Rockwood 8315BSS
2016 F250 SC LWB 4x4 6.2 3.73
Reese Dual Cam