Join the FMCA first, then use their Fleet Advantage program to purchase Michelin XRV tires. Not only will you save considerable money, you'll be getting tires specifically designed for an RV (thus the XRV) and running cool for highway driving. I got 10 years out of my 1st set of XRVs. The Michelin shop said they were still perfectly good when I replaced them with new. I ended up selling them on CraigsList!
Weigh your coach and use the Michelin chart to set your cold inflation pressure accordingly. That will insure even wear on your tires.
Alfred
2005 Sightseer with Workhorse, ReadyBrute Elite towing 2003 Honda CRV
Map below shows states where we actually camped.....