Tire Tread/belt problems of the 2001 Chevrolet Express

The contact stated the tread separated from the left rear tire. This happened on a rental car that the contact's husband was driving. The tire dealer could not determine the cause of the failure. Updated- the consumer struggled to maintain control of the vehicle, however he did managed to bring the vehicle to a safe stop.

While driving rear driver's tire tread separated. Consumer pulled and changed the tire. Dealership will be notified. Firestone, lt24575r16.

Belt separated.

I run a rental car CO. In the past 6 months I have had 5 of the firestone s4s steeltex radial 16 inch tires, that the tread had rolled off the 15 pass van, someone is going to get hurt bad . . I went to the local firestone store and all they want to do is make an adjustment on the tires that failed, but I have this tire on all 7 of my vans and I am afraid to rent them out. . . I need some help from firestone to replace all of these tires. . . Help me before someone gets hurt.