Many motor homes had cap fade because the manufacturer cut corners and eliminated the titanium oxide from the resin. I see the 5th wheel manufacturers are cutting the same expense in the process. Oh well, full body paint with proper paint and sealer will last the life of the trailer-- assuming the manufacturer has not cut corners with the paint and painting process.I'd go with the paint and add the level up later, cap fade from Gel Coat is something you can't fix. Leveling you can.
I'd go full body paint as well. Until Lippert figures out what the mystery popping noise is I would avoid their leveling system.