I owned a 2003 American Tradition with a 3 jack system. I had the same problem with the door. I stopped at the factory on a trip to an FMCA rally and talked to the service manager. He said if you look at the newer American series of diesel motorhomes, you will see that they use a 4 jack system. The change was made by the manufacturer for a reason - these coaches are very heavy and the 3 jack system is a problem. I asked what could be done and was told they could try to reinforce the frame in the front and that helps "sometimes". I was told that the problem was that with the jack in the middle, the frame tends to "sag" on both sides of the jack thus your door gets out of alignment. He could not give me a good figure to "fix" the problem but quoted at least $500 to provide some measure of "fix".
My solution was to only allow the front jack to take minimum weight off the front end by manually manipulating the 3 jacks. I also made sure the MH was facing "uphill" when I parked it.
My final solution was to buy a later model with a 4 jack system.
