MY WIFE AND I WERE DRIVING S/B IN THE CARPOOL LANE ON THE 605 FREEWAY AT 65/70 MPH WHEN WE HEARD A FUNNY NOISE COMING FROM THE RIGHT REAR TIRE. THINKING WE HAD A FLAT, WE STARTED TO MOVE OVER TO THE RIGHT AND EXIT THE FREEWAY. AT AROUND LANE 3 I COMPLETELY LOST CONTROL OF THE VEHICLE. IT FISH-TAILED TWICE AND THEN FLIPPED OVER AND SLID INTO THE ICEPLANT ALONG THE SIDE OF THE FREEWAY. THE TRUCK THEN RIGHTED ITSELF AND WE ENDED UP FACING N/B ON THE SHOULDER. WE COULD HAVE EASILY BEEN KILLED!!! MY WIFE SUSTAINED SOME BUMPS AND BRUISES BUT IS OTHERWISE OK. I WALKED AWAY WITHOUT A SCRATCH. ON INSPECTING THE TIRE (WHICH WE NOW HAVE IN OUR POSSESION) WE NOTICED THAT THE SIDEWALL HAD COMPLETELY SEPARATED FROM THE REST OF THE TIRE!! MY WIFE AND I ARE CONVINCED THAT THESE FIRESTONE WILDERNESS HT TIRES ARE UNSAFE!!! WE HAVE PHOTOS OF THE TRUCK AND WE SAVED THE TIRE. IF YOU HAVE ANY QUESTIONS - PLEASE CALL US ANYTIME. THANKS - WALLACE (DOT NUMBER: W2UU TIRESIZE: P225/70R15)