I had the coach in shop to replace slide out seals. While there i had tec measure hight is was 11ft 8 inches tall with air dumped. So with garage door being 11ft 10 inches , I went for it . I dumped air. Got DW on a step ladder to watch. She watched while i drove in with me holding the dump air button down. Made in just fine. This Dec when i go to Az i will air up with my air compresser to release the parking brakes and start engine and back out holding the dump button down. Got a smart DW to help. Thats my story and i'm sticking to it.
Benchrest Later as what blackhillian said he did. I'll put a switch on the dump button.