The fiberglass walls are a laminated fiberglass using the pinch roller method and have been know to de-laminate on this model. The better method of lamination which is used by "Jayco" (nations largest manufacturer of Travel Trailers by volume) is know as the vacuum-lamination method. This method is better but can also de-laminate but not as often. All laminated panel construction travel trailers have seams where connected to the roof area and at corners.
If you are considering such a trailer also ask if the frame is 2X3 or 2X4 wood studs or metal welded studs...the metal is the best in this type of trailer as it is stronger and often lighter in overall weight
I have been around travel trailers since 1980 and believe me there is a lot to learn in order to become a "wise shopper". Read a lot and ask a lot of questions.
This industry has produced products with quality problems for decades and many have not been addressed. It is hard to find professional reviews of this product group so we must rely on each other for information.
Subscribe to a lot of web site and read. Try the following in addition to this one.
irv2.com......rvtravel.com...do it yourself RV....RV.net. There are others where you will find folks who RV camp all willing to help.
Good Luck and Happy (informed) Camping !