Two thoughts. First delam can also occur when things are tarped too heavily and that is one of the reasons the covers you purchase are vented. They really are not supposed to be air tight. When I tarp our truck camper, I only bring the tarp part way down the sides and we don't wrap it. On our fifth wheel we use a vented cover for that purpose. Ideally they have to breathe.
Working professionally on RVs for decades I can tell you delam repair borders on the impossible. There is an adhesive specifically designed to adhere it back into place, but you have to be able to pour it into between the filon and the backer and then you have to be able to clamp it for 24 hours. For small bubbles you can drill a small hole and shoot the glue in ( I used a large hypodermic needle, but again it is a total B and not for the faint of heart.
