I remember quipping to the firm I subcontracted to that "most RV places could not count past 10 with RV electrical without unzipping their pants..."
Use exactly the same stuff that a cruising sailboat owner uses. They need holes drilled that could leak if not done right. They need power distributed and wires run. DuPont 5200 is adhesive meant for the cruelest environments on earth. Stainless screws and 5200, stainless bolts and lock nuts should do the trick.
Funny though some RV'ers want a mickey-mouse job done. So I guess the friction runs both ways. Some of them are shocked when I smile and say "Sorry, no can do".
