I think what contributes to delamination on these is the sprayed on glue and moisture build up from condensation in between. Other factors are areas without framing, relying too much on a shell and bead board sandwhiching.
Kinda like all the problems on homes with the stucco finish called 'Dryvit' stucco. It has a very thin shell of latex base and sand coated over bead board I think that's right, but I know it builds moisture to a point of causing much damage.
Now if your in the habit of airing out your fiberglass camper and don't use it full time in winter it's a great camper without the moisture build up.
BTW, keep your jack heads covered in winter, been doing that for years.
