We have a van that has michelin tires (225/75 r16). the vehicle had 37000 miles at the time of the first incident and the tire began to show separation on 6/2/2013 at 3 pm. the tire was replaced at a certified tire business. the opposite rear tire began to separate on the subsequent trip as we traveled to houston on 6/6/2013. we were traveling around 60 miles per hour and again the tire showed signs of separation. *tr