Tire Tread/belt problems of the 1996 Toyota T100

I was (a 53 yr old woman) driving alone thru the desert, pulling a travel trailer (2,500 lbs) when the tread suddenly peeled off my front right tire . It was daytime, July, hot and I was going about 60 mph. Luckily I was able to stop with out injury or damage. I immediately replaced all 4 tires because of my distrust of the them. The dot listed is off one of the tires( that I now have as a spare)--I don't have the one that peeled. I asked the tire people to save the best of the 4 for a spare. I am furious that I risked my life on tires that were known as defective. ( dot number: w2hl imo 3 tire size: p23575r15 ).

Defective treads on bridgestone (p235/75r15) tires.

P235/75r15, dunlop grand track tire blewout due to tread separation. Dealer and dunlop manufacturer have been contacted.

Pe-00020; while driving vehicle began to pull to right due to tire tread separation. Tire size 31x10. 5r15lt, dotvd60aw4. These tires were original equipment purchased on a Toyota, T1000 1996. Please give any further details. Firestone wilderness at 31x10. 5r15lt.