2001 CHEVROLET PICKUP Tirestreadbelt Problems

WHILE DRIVING 60 MPH REAR PASSENGER TIRE TREAD SEPARATED. AS A RESULT, THE REAR BRACES WERE DAMAGED. CONSUMER LOST CONTROL, BUT MANAGED TO REGAIN CONTROL. *AK WHILE DRIVING AT 60 MPH THE PICKUP STARTED BUCKING AND FISH TAILING. TREAD SEPARATED FROM THE TIRE IN ONE PEICE BUT TIRE DID NOT GO FLAT. PASSENGER SIDE REAR FENDER AND MUDD FLAP DAMAGED. TREAD THEN HIT THE 5TH WHEEL TRAVEL TRAILER. *TC

DURING A JULY TRIP FROM GLENDALE ,CA TO THE EASTERN SIERRAS AT 4HRS INTO THE TRIP THE LEFT REAR TIRE DELAMINATED ON MY CHEVROLET 1500HD. I WAS CARRYING A LANCE LIGHT CAMPER ON THE TRUCK. THE WEIGHT WAS WITHIN LIMITS OF BOTH TIRE AND TRUCK. THE TIRES WERE INFLATED TO 80 COLD PSI PRIOR ON THE DAY OF THE TRIP. THE TEMPRATURE WAS 108 DEG F. MY SPEED AT THE TIME WAS 67 MPH. IN AUGUST, ON ANOTHER TRIP TO THE EASTERN SIERRAS, THE RIGHT FRONT TIRE DELAMINATED AT APPROXIMATELY THE SAME LOCATION UNDER THE SAME CONDITIONS.LUCKY FOR ME THERE WERE NO INJURIES OR DAMAGE TO THE VEHICLE. THE TIRES ARE ORIGINAL EQUIPMENT FIRESTONE STEELTEX R4S LT245/75R16 RATED E WEIGHT. THE TIRES HAD 17,700 MILE AT THE TIME OF SEPERATION. THE BISHOP FIRESTONE STORE REPLACED THE FIRST TIRE UNDER THE LIMITED WARRANTY, MY COST $69.00 FOR TREAD WEAR. I'M CURRENTLY...