I keep seeing so many stories about fiberglass walls delaminating and the such with luan as part of the construction. I see people who don't even have water damage and the walls are coming apart. So...
When we buy our next trailer (fairly soon), I will negotiate to have the roof maintenance covered by some sort of contract if there is such a thing. These TT manufacturers absolutely love to blame improper/lack of roof maintenance from customer and deny warranty claims. I don't think I've found one RV company google review where I haven't read that several times.