So ive settled on the type of vehicle I would like to get. A 12' unicell aerocell cw on a chevy or gmc chassis with the 6.0. I would like to try to find a used one with low miles, which I see pop up from time to time around the 25k range. Problem is, every singe one I have seen have the roll up rear door, not the full size barn doors. I am planning on insulating the cargo/sleeper area really well, so if I can find one with the barn doors I was planning on running a window ac through the door. I know a lot of people say they don't do the trick, but ive heard others say they did ok. I would be wiling to give it a shot for the price difference. But, its looking like I probably wont be able to find one with the rear doors, so I may have to go the rooftop route. Has anyone ever mounted a rooftop ac on one of these type of units? Ive searched the forums as well as google and couldn't find anything. Im sure I would have to reinforce the roof, but the thing that is the biggest question is the translucent strip going down the middle. Thanks for any and all responses.