Yes, delamination can be a problem. The KEYSTONE line has had many issues with it happening on new trailers. A good dealer/manufacturer will stand behind the product if necessary. Before you buy ANY trailer...check closely into what they can do for you if this becomes an issue.
For the most part...KEYSTONE stood behind most of the problematic delamination problems...to my knowledge. I like fiberglass trailers myself...although my new SALEM is not. Good luck.
Pete (Jolly Mon)
2014 Jayco Whitehawk 24 RBS
2004 Nissan Titan LE, 4x4