The EPDM (I think it is EPDM) roof on my 2004 Outfitter TC is coming unglued from whatever is underneath it. I see several areas that are lifting up. None are raised more than 1/4" but they show up....
It should not balloon or have enough loose membrane to lift of flap. It's just a matter of time until repair or replacement is needed.
FWIW, I am a commercial/industrial roofing contractor. We do mostly EPDM rubber and some TPO roofs, I build them to last 30+ years. If I did my roofs to the same low standards as the RV industry, I'd be in jail or bankruptcy court.