Tire Tread/belt problems of the 2002 GMC Yukon

Continental sport lt/SUV tire tread was coming apart on the highway.

Tread separation on firestone wilderness tire.

Tires on 2002 GMC Yukon xl firestone wilderness p265r70-16 are cupping and are worn out. 26000 miles. GMC dealer says it is tire defect, firestone dealer says it a design defect in vehicle. Firestone dealer says they see numerous cases of premature tire ware due to design defect in vehicle front suspension. Need assistance in resolving issue of defect tire vs vehicle.

I bought a new 2002 Yukon xl which came with firestone wilderness le tires including the spare. I have rotated all tires properly and according to the maintenance schedule, every three to five thousand miles. I have had the front end alignment check out, which was found to be perfectly in alignment. The tires have 24,000 miles on them. All four of my tires are defective with high/low spots on the outside and inside tread. The three center rows of tread are wearing perfectly correct and even. The tire shop and the dealership reccommends replacing all the tires because they are a safety hazard and could possibly cause me to have an accident at higher highway speeds.

Upon rotating the tires mechanic determined that all 4 tires inner tread was cupping. However, mechanic could not identify the cause of the tire cupping because vehicle's alignment was up to specs, and tire pressure was well maintained.