I'd suggest you do a forum search using the term "TIRE WEAR".
There are a number of threads relating to the same issue. Most of the threads address why it occurred and give details of what was done to correct the problem.
Here are a couple to get you started:
http://www.keystonerv.org/forums/sho...ight=tire+wear
http://www.keystonerv.org/forums/sho...ight=tire+wear
http://www.keystonerv.org/forums/sho...ight=tire+wear
Good luck and keep us posted on what you find out and how you fix it.