darn sun, darn water. The two can cause delam. Bought an Arctic Fox several years ago in Las Vegas and lived in it in the Thousand Trails campground for a while. After a while when the sun got around to one side of the TT I began to notice a slight bulging in about a square foot area. Would go down a bit at nite. Traded that one in.
Now have an '05 Trail Cruiser with a couple of places where its delaming a little. The idiot manufacturer secured the fridge freezer drain hose just behind the removable vent, not to the outside. So the water ran down between the aluminum frame and siding since then everytime the fridge defrosted so lots of water caused a line of delam as it headed to the floor. I obviously took the screw out of the hold down and threaded the pipe out the vent holes.