1995 GMC C SERIES User Comment / Complaint

I was driving down the highway and my left rear tire come apart than blew out i took it to a tire shop to have checked, and they had less than 20k miles on them since they installed them was told right rear was bad to so i bought two new tires and had truck aligned and front tires balanced and they rotated new tires to the front and less than 500 miles later i had another left rear tire separated and i called tire shop and sounded like owell so i didn't trust these tires so now i just bought four new tires from big o tires so now i have tires in my garge that i'll never use .also tore up my truck both times.