Dave, without seeing the actual wear pattern it's hard to know but it almost sounds to me like a balance problem. If the wheels were balanced off the truck and have not thrown off any weights then that's not it. But if they balanced the wheels while on the truck, then your balance is likely off since you moved the tires. Balancing on the truck does a superior job of balancing but I don't even know whether they still balance that way these days. Alignment or balancing, I'd guess.
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