Our old 89 Southwind uses 8R19.5 tires and I bought 4 Samson tires for it, the other two tires were fairly new and they are Hancooks. If I had a coach that was actually worth looking at and was going to do a lot of traveling, I would have invested in better tires but for something thats only going to go out a few short trips a year, these cheap chinese tires are good enough. Besides, in this hot dry heat we have, they'll be rotten long before they wear out.
I was able to get the Samson tires for 1100 bucks, mounted, balanced and new valve stems, that was for 4 tires. No one else had tires anywhere near that price.