Wheel Rim problems of the 2008 Mercedes Benz E Class

The contact owns a 2008 mercedes E Class with 18 inch rims. The contact stated that while driving 25 mph over a pothole, the tire immediately developed a blister on it. The dealer stated that three of the rims needed to be replaced since they were out of round. The dealer replaced one tire, two front rims, one rear rim and performed an alignment. The failure did not persist but the contact was concerned that the failure would recur. The failure mileage was approximately 6,000 and the current mileage was 18,000.