I'm looking at buying a 1999 Jayco Heritage popup. It is in really good shape except the roof. It has the solid fiberglass (or is it plastic) single piece roof with air conditioner. The points of the roof where the hold down clamps are fastened have broken off or are cracked. I don't see any way of fixing this without replacing the whole roof. Has anyone ever done this or know what a new roof would cost? I have enough help and know how to get the job done but I just don't know where or how to go about getting a replacement roof. Is this even feasible. This is a picture of a similar one with the one piece top.