We just finished a 2 year rebuilding, replacing & updating our 2006 Montana 3500rl we bought from a private owner. We were clueless but now we know it inside & out.
A week ago we hired a company to cut & buff the fiberglass so we have been looking at the surface a lot since it was totally botched. (Different issue. :facepalm) This am we saw a curving crack that runs in an arc from one edge of a side wall around to the adjacent wall - not straight in a direction.
Any ideas how to trouble shoot or resources to research? Not sure of the depth yet.
Note. We are full time & stationary. It has not been moved since locating here.