I have a 2015 BH 3750FL and right under both rear slides in the corners the walls are delaminating. One side has actually started to crack the fiberglass. This seems to have progressively gotten worse over the past couple years. I have only ever crossed paths with one other owner of this model and his was a couple years newer, but his looked like it was starting to delaminate in the same area. I have always inspected the caulking. Last summer removed all the old caulk and recaulked the entire rig with Lexel. It doesn't appear to be a water intrusion issue and if it is I have no idea where it would be coming from. The crack really makes me thinkit may be a structural flaw since there is very little wall structure due to slide and storage compartment cut outs. Are any other 3750FL owners experiencing this?