I rotate the tires each spring (5). I do inspect for abnormal wear. Unless I understand incorrectly, cupping sounds more like over-inflation than from turning. However, over such a short distance, I wouldn't expect any notable wear from driving. I turn a hard 90 every time she gets parked as well, and don't have any abnormal tire wear, nor black marks on the driveway.
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Walt B
"Debt-Charged"Black '07 H210SS6.2L Bravo One turning a 21P HIFive
Wakeboard Tower with Perfect Pass Stargazer version
Missouri River; Kansas City, Mo.