heat causing problems inside RV

I'm not so sure it is just a heat problem because as one person responded, he lives near the coast and has similar problems with his PW. Although I am sure that the high heat only makes the problem much worse. I'm not in a rush to fix the issues, I will eventually get it repaired myself after gathering information on the best way to do it. You see, the interior side of the exterior wall in the bathroom is actually separated from the caulking on the wall it attaches to next to the toilet. The wall actually moved about 1/2 inch from its original position. I can recaulk it, but it would not be in the original place it was. Of course that might not really matter much. There is no way to put the wall back where it was when new. Just kind of a shame that you walk into this beautiful RV and see cracking caulking, separated walls, a formica panel coming off the bathroom wall, and a warped ceiling near the front top cabinet near the cab. It is only an 09 with 7000 miles on it. But keeping my perspective, it is not a big problem in life, it is only a "thing" that can be repaired. Good health to all and thanks for the tips.....Don.