I just had all 8 replaced at CoachWorx for $815 each, Michelin 315 XZA2. They only had 4 locally and had to order the other 4, date codes for the first four were only a couple months older than the brand new ones.
While we were at it, also replaced all air bags and shocks, also new batteries, both house and chassis. Along with all that, needed a new 24v battery charger/inverter, a hot water heater, cruise air A/C compressor, re-coated/sealed the roof, fuel lines, and general service.
Now we have a brand new 27 year old coach!
Hmm, no signature? Wierd.