I had the same issue as you on my 2008 Montana 5th wheel. Turns out, the bolt that holds the leaf pack together on the rear axle (passenger side) had sheared the little nub at the bottom of the leaf pack off, the one that holds the axle in place front to back. The rear axle had slid back a few inches on the passenger side, causing the same wear you described (I have pics I can email). At first the dealer tried to pawn it off on me, stating aggressive driving, and no warranty coverage. I didn't like his answer, so I contacted Keystone myself, and they graciously covered the repairs. The dealer still tried to charge me small fees here and there for Service, but that's another story (I won't EVER go back to that dealer). Bottom Line: Check your axles and make sure they're in the proper position on the leaf springs.
Bob
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