I saw mine while operating a motorcycle in front of wife driving our rig. Upon inspection I would see the rubber roof was unglued and easily lifted in the front.
An RV tech told me the air to lift the roof comes from the hitch, up the fiberglass cap, and under the front metal strap. Sure enough, we found about only a few screws holding the metal strap down making it easy for air to pass through. Hard to believe we found shoddy workmanship, huh?
The RV Tech re-glued the rubber roof from the front and under the a/c. He said many will come loose back to the a/c. His work has held up for several years now. Unfortunately, the tech is no longer around.