Last year we bought a used rig with two year old 19.5 Goodyears. The test drive was unbelievable, the thing shook like a wet dog, going down the road. As soon as I got it home, I arranged for a truck tire shop to true the treads with a tire lathe. The right front was roughly 3/16" out of round, and produced a pile of shavings roughly the equal of two, gallon milk jugs. The other front was about half as bad. The shop foreman assured me that this would resolve the issue and told me to take it out on the highway for a test drive. The problem was better, but far from cured. Next they cut the other four tires. All were significantly out of round. This resulted in a ride that was dramatically smoother, which gave me an opportunity to discover an odd issue. The front would wander and the steering wheel would oscillate, as it was coming to a stop. Really an odd feeling. Back at the shop they lifted the front end and used an air spinner to get the wheels up to highway speed. As the right front slowed down, the whole front of the motorhome began to shake violently. Once it slowed down further, the extreme tread rivering was quite clear. Pretty shocking to see fairly new tires, with very little mileage on them, in that condition.
I'll give these things another year before they get tossed. I can't imagine using another Goodyear product on anything I own, at this point.