 How do I get the dealership to acknowledge this issue?Both rear tires are extremely worn and cupping causing a deafening roar on the inside of the car. The rear slips and fishtails over bumps in the road (regardless of whether we are going 35 or 60 mph). I thought it was something we needed to get used to, but after much research we realize there is a serious issue. Finally took the car in yesterday to Rick Case Hyundai and the service tech told me it was normal because the rear axle is a solid fixed axle so it cannot be out of line and that the fishtailing/slipping is just because the car is lightweight. Rear tires are visibly pigeon towed and roll slightly inward.