Tire Blowout problems of the 1999 Chevrolet Express

While driving back from a field trip in our 15-passenger van full of children, the steeltex r4s tire had a blowout and tread separation. By some sort of miracle our driver, going 55 mph on the highway, manage to keep control of the vehicle. Thankfully all the children are safe,but I am extremely concerned that I was unaware of other complaints regarding these tires. I would have never let the children ride in the van with those tires if I knew the problems with them. There was some damage to the drive shaft due to the blowout, but the vehicle is still in the repair, so I don't know how the damage occurred.

While driving the right rear tire blew out. Please provide more details. Ts.