I've used Air Lift in two previous P32 chassis coachs, no problems with either one. They ARE hard to put in though. Make sure they are warm when you try to roll them up. I used a vacuum pump and some zip ties to keep them in shape till you get them through the hole. The second set was a piece of cake after I learned what I had to do.
There are videos on line to show what you have to do. Having a vacuum pump just made it easier for me.