I have an Aliner and I have gone through 2 air conditioners (5,000 and 6,000 btu) in 5 years (the last one only lasted 2 weeks and died 2,000 miles from home). The design used pop rivets and caulk to hold the a/c in the side of the wall of the camper - not a quick fix to replace. The constant jarring over thousands of miles without any shock absorption seems to do them in. I plan to get a portable air conditioner and vent it to the outside through the same space where the a/c is now. I can figure out a way to cushion it in the camper. This small size a/c works fine for cooling the Aliner.