Gladiator QR25-TS Trailer ST205/75R14 105/101N D Trailer Tire

I bought four of these tires in the spring of 2017 and went from Florida to New Mexico and the tires seamed to be working good. On the way back across Texas in October I noticed that the two rear axle tires were starting to come apart in-between the tread areas. I had to stop in Tyler Texas and get two new tires on the rear axle. After a few months in NC, Ga and FL of light highway use and travel we went to Atlanta Ga. in the spring of 2018 for some family visits and lunch with a friend at cracker barrel. Before leaving to continue east I checked all my tires and lights like normal and all seamed well. We left the restaurant and had been driving about 30 minutes when the right front trailer tire blowout. The tire did not catch fire, it was like the tire was all powder and just was not molded together properly. I got 4 new Goodyear Endurance Trailer Tires from Discount Tire in Gainesville Ga. and have about 8000 miles on them and have not had any problems. My travel trailer is 7000lbs and I use ST225/75R15 load range E.