Defective Tires

In two years of ownership of my Trailmanor and less than 10,000 miles on the tires, both manufacturer mounted Goodyear Tires have lost tread on the road and blown out. On both occasions I was traveling "dry weight". The most recent event involved not only the tread separation and blowout, but when the trailor dropped the dump valves for the holding tanks were ripped off. A word of warning. I also found that Goodyear trailor tires are not waranteed! I am going to investigate having light truck tires installed after my drain system has been repaired