Tire Bubble problems of the 1997 Jeep Grand Cherokee

The contact owns a 1997 Jeep Grand Cherokee equipped with goodyear wrangler radial (p) tires, size p235/75r15. While driving approximately 45 mph, the vehicle began to shake. The contact pulled over and noticed that all four tires were out of round and had bubbles on the sidewalls. The vehicle was taken to a local repair shop where the tires were replaced with another set of the same tires. A week later, the failure occurred again. The vehicle had not been inspected or repaired. The failure mileage was 163,097 and the current mileage was 165,660.