Hi:
4x4's are hard on tires, especially if they are an agressive tread designe. Yes, and alignment may help, but cupping can be caused by bad ball joints, shocks, or other steering components. Just make sure that before having an alignment, that all components are good and tight. Most alignment mechanics check the components prior to an alignment; however, I'm sure some don't take the time.
Joe
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Friday, November 28th, 2008 AT 9:45 PM