Cupping is not caused by front end alignment on MH because you normally have no camber adjustment and caster does not wear tires. Toe in adjustemt will wear both front tires across the middle. It can be caused by worn suspension components, bad shocks. Or the tire out of balance. We do have a problem with Goodyear RV tires rivering which is wear on the second tread in which is a Goodyear problem but it should not be cupped. Take a close look at your shocks and see if there is any oil leaking down on the lower tube. Also try taking the tire and wheel how it is and put it on a balance macine and see how far off it is.
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Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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