At 5,000 miles I took my van in for servicing. The shop I purchased it from checked the alignment saying it was off so they fixed it without rotating the tires. Today at 12,500 miles I took it to my local shop for a rotation. The guys told me my rear tires were cupping and didn't recommend putting them on the front. They think the first shop might not aligned it correctly. (The first shop did take 2.5hrs with three guys trying to align it.) Anyone ever have this issue? The van rides smooth so I've never noticed.