I have seen this caused by heat....ie storing out in the hot sun. But one more thing to check is make sure that you are not getting any water leaks behind the areas. Windows will leak after a few years.
We had one RV, A Pace Arrow, that had the vinyl wall cover pulling at some of the corners. I found that I could take a small sharp knife and carefully slit the puckered spot. I use a wall paper (Vinyl to vinyl) paste to stick the areas back down. It seems to hold up pretty good in the Texas heat.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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