I bought a used (about 5 year old) Aliner and kept it for one summer, then sold it. The design allows frame twisting and sagging, which leads to misalignments. The door was rubbing on the jamb. Then one of the side windows started to jam when open and it was really tough to get it closed, the slider part catching on the stationary pane's frame. The weatherstripping around the panels was peeling. And I often felt concern about how it would be to erect or fold the unit in heavy rain or wind; what if a sudden gust caught the roof panel while I was doing this? I also missed having upper storage cabinets; bending over to get everything I needed soon got tiresome.
Before buying the Aliner, I looked at a brand new Rockwood A frame. It looked nice. But then I noticed the drain line going through the floor.... the hole was 3 times the diameter of the pipe and there was nothing to stop road dirt, water, mice, etc from entering upward through this gaping hole. The shoddy workmanship turned me off.
If at first you don't succeed,
skydiving is not for you.