Installing a taller door in my Class A Fleetwood Flair

North-Man; Welcome to the forum. I have a 04 Flair, and it has aluminum frame work. The door measures 80.5" from the bottom of the threshold, to the top outside of the door frame (where the header is, not the top of the frame). I would be very unwilling to cut out a header and try to re-weld an new one in. The side walls are isolated with foam, a fire hazard. Measure your door opening before you get carried away on mods.