WHILE TRAVELLING AT 70 MPH, THE BACK OF THE TRUCK STARTED TO "BOB AND SWAY." THE TIRE THEN CAME APART AND THE TRUCK WENT SKIDDING ACROSS 2 LANES OF TRAFFIC A TOTAL OF THREE TIMES. DURING THE SKID, THE VEHICLE HAD A HEAVY ROLLING SENSATION AND FELT AS IF IT WERE ON ONLY TWO WEELS MULTIPLE TIMES.( DOT NUMBER: VDHLIPY TIRE SIZE: 235/75/R15 )