Actually the tires have very little to do with the ride. The smooth ride is all determined by the shock absorbers and the type of suspension you have on your coach. Because if a coach is pulling to one side or the other that could be caused by weight distribution or some mechanical adjustment that needs to be done. If your tires are wearing uneven it could be weak shocks, If they are rivering, you might need cambering. But the smoothness of a ride is 90% on the type of shocks you have and the airbags or leaf springs etc. Tire has very little to do with the comfort.
I have had tires on my coach that needed to be changed out because of side wall cracks, but the ride was just as good as the new tires.
