Uneven tire wear can be a result of a number of causes but if your tires are worn on only one side it is usually a result of loss of camber, over loading or an alignment issue. I would suspect that it could be an alignment problem. Uneven tire wear is not uncommon as the suspension system, axles and the tires themselves that are found on most, if not all RV's that come from the factories, are of marginal quality. At best, they might meet the minimum safety requirements but that would be it.
I would bet that the hangers, brackets, bolts and bushings found on your suspension are worn and probably need replacing already. The flimsy, thin nylon bushings, for example, won't last long with normal, yearly driving. I replaced all of my components after only 2 years.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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