My W&P 2008, 28' is sitting in the driveway. The way the sun is shining on the side I notice what appears to be a big wave in the wall near the front drivers side. Upon further investigation it is. I've seen small waves before, but this is much different. When I press on it it fills like the outside skin is delaminating. I go inside and the inside wall paneling is doing the same. Checking the door side it too looks like it's doing the same thing. This only affects about the front 8-10'. Checked the roof, no leaks, eternalbond is fine.
It's been above 90+° for over 2 weeks with little rain. Last outing was June 6-9. Did have the gray water tank over flow, but quickly got it cleaned up.
Anyone know of a cause, or have heard of this happening.