WayKar, welcome to our website and forum. Where are you? While out in Arizona and working for a dealer out there; I found out we needed to keep a bucket of water in the coaches so the wood and stuff would not dehydrate and split apart. This may help this issue as well. Some manufacturers will not install high grade wall board on their lower end coaches and you will always have this kind of issue. Let us knw of some brands you are looking at for feedback from those that own or have owned them. Good luck and enjoy the forum.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7