Tire Tread/belt problems of the 2000 Toyota 4Runner

Tire blow out caused vehicle to hit a guardrail. (the left tire experienced a blowout) the consumer had moved over to the middle lane when the tire blew.

While travelin gon highway at 30 mph heard a noise. Pulled over to the shoulders, and noticed that right rear tire tread had separated.

When I bought this vehicle, I did not want firestone tires on the vehicle, but the dealer said the truck tires were fine. (I had had a firststone tire come apart on my 98 corolla on the highway which put my son in the ditch with some 250 dollars worth of damage to the car. ) the latest incident was the 4 runner firestone at11 lost air rapidly on the highway with my son but he was able to slow down quickly before it flattened completely. . The tire dealer said it was a punture in the side wall but I do not believe it. This tire had less than 06000 miles on it. I am going to change out the this set of tires and spend 400 dollars for my son's safety. (I took the firestone tires of the corolla at 3000 miles because of the incident). Its sad but their tires are inferior and anyone who drives on them are at risk. ( dot number: tire size: 225x75x15 ).