I replaced old Michelins with Toyos last year, have 5k or so on them. I used motorhometires.com which was serviced locally by Southern Tire in Weslaco Texas. They came to my rv site in Alamo, TX and changed them, balanced them with beads.
In my return to the RGV (Rio Grand Valley in the bottom tip of Texas) I had a slow leak in one of the outer duallies. When we headed out to go back north last month I pulled into Southern Tire in Pharr TX (they have several locations) and they removed the wheel and fixed the loose extension hose. Charged me 10 bux. Nice company to work with.
If you don’t want to move your rig, I highly recommend Motorhometires.com. They have agreements with installers in all the states (except maybe Hawaii and Alaska).