DURING THE PAST 3 YEARS WE HAVE HAD 5 TIRES FAIL ON OUR 24 FT. MOTORHOME WHILE TRAVELING AT 60 MPH ON THE OPEN ROAD. IN ALL 5 CASES THE BELTS APPEARED TO SEPRATE FROM THE TIRE AND CAUSE THE TREAD TO COME OFF. THREE TIMES THE TIRES BLEW OUT WHILE GOING 60 MPH. I TOOK THE TIRES TO FIRESTONE DEALERS IN PALM SPRINGS AND LANCASTER, CA TO BE REPLACED, ON EACH OCCASION I ASKED IF THIS WAS A PROBLEM WITH THESE TIRES AND WAS TOLD IT WAS NOT. IN IN APRIL 2000 I REPLACED THE 2 FRONT TIRES WITH LOAD RATE E(ALL ORIGINAL TIRES HAD LOAD D. I WAS TOLD BY THE FIRESTONE DEALER THIS WOULD HELP THE PROBLEM.) IN PALM SPRINGS AFTER I HAD A BLOW OUT ON THE FRONT. IN AUGUST I REPLACED THE OTHER 5 TIRES WITH LOAD RATE E AFTER HAVING 2 BLOW OUTS IN ONE DAY, BOTH ON THE REAR..*AK (DOT NUMBER: VDIL 1XB 4 TIRESIZE: LT22575R16)