On my first TT (2010 Keystone) the fiberglass de-laminated causing a couple large bubbles on the left sidewall. Keystone said the fiberglass is bonded with a water soluble adhesive and water must of leaked around the window and I should of maintained the sealant. After they inspected it they decided it was a bad batch of adhesive. Ended up having the entire sidewall replaced. Was very lucky on that one, it was 3 months out of warranty and they covered it.
2015 Rockwood Windjammer 3029W Diamond Package
2014 RAM 2500 Laramie Longhorn 4 x 4
6.4 Hemi 410 HP, 410 Rear Axle