Tire Tread/belt problems of the 1997 Chevrolet C3500

Pe00 020; consumer was traveling about 72mph on highway and heard a noise. He was able to pull over, and saw that driver's side left front tread separated. General tires, p235/7016 .

Driving 60mph heard a loud pop. Pulled over & saw the left rear tire had lost all tread. Tread had hit vehicle & bent fender. Part of tread was still on tire which had deflated. Placed spare on. Took vehicle to tire retailer & had it replaced. Other 3 tires were okay. 1997, Chevrolet 3500(replacement) with 13,000 miles. Firestone, steel tex, r4s lt 265/75r16, dot vnw81xm278.