On a 2015 mitsubishi outlander with 51,000 miles. my toyo a24 tires dot number n300 started cupping. regular tire rotations were completed. i talked to the mitsubishi technician that replaced my tires due to the fact they'll fail state inspection and he believes it's a manufacturing defect. vehicle was stationary at time of discovery. car had a thumping noise while going to dealership for emergency maintenance on interstate and local roads.