Tire Tread/belt problems of the 1996 Dodge Grand Caravan

Consumer purchased bridgestone bt70z tires, about a month ago the tires were already cracked. Specifically, driver's side rear tire. It had a crack that was about 1 1/2 inches long located on the tires tread.

I was travelling on the freeway at about 70 mph when the tread blew off the left rear tire. It happened with the right rear tire about a month and a half ago the same way. The tread was not worn, the tube was intact, but the tread was completely separated from the tire. The first time it broke my brake light and dented my rear fender and bumper. This time the damage was much worse. It caused the fuel tank connection to become loose, tore the fender on either side of the tire and ripped the bumper off of the car.

Left rear tire had major tread separation at 70-75 mph. Tire remained inflated. Tread depth is 5/32. Nlm.

Tread is separating in chunks and exposing steel belts. (dot number: t2749938 tiresize: p215/65r15).