FORD F-250 PICKUP EQUIPPED WITH FIRESTON STEELTEX RADIAL LT265/75R16 LR E TIRES, TOWING 30FT TRAVEL TRAILER AT 60MPH, HEARD LOUD NOISE AND THUMPING SOUND FROM RIGHT REAR PASSENGER SIDE. WHILE DECREASING SPEED TO PULL OVER, THE DRIVER'S SIDE REAR TIRE ALSO FAILED CAUSING TOTAL LOSS OF CONTROL RESULTING IN BOTH TRAILER AND TRUCK SPINNING 180 DEGREES ON FREEWAY WHICH CAUSED THE TRAILER TO OVERTURN, BOTH COMING TO REST IN THE DIRT HIGHWAY MEDIAN. NOTE: TIRES/VEHICLE WERE INSPECTED BY THE DEALERSHIP 3 WEEKS PRIOR TO THE ACCIDENT AND TIRE PRESSURE WAS CHECKED THE MORNING OF THE ACCIDENT.