My roof pulled loose up front from the front cap trim to the a/c. Going down the road the roof membrane would rise up. Tech told me the air comes from the hitch up thru the cap and the air slips under the trim to pull loose the roof membrane. My trim was installed with very few screws. The tech re-glued the roof and used two trims with lots of screws. This was 10 years ago and roof is still doing fine.
I have bought Eternal Bond on Ebay, Amazon, and Roofing supply stores on the Internet. Heck I use that stuff for other fixes as well.