Lots of threads here regarding tire life / replacement. Also PM tire brand recommendations.
I am on my third purchased set of Michelin XRV tires. No problems and will likely buy again next time.
Note that your used tires are worth money selling them via Craigslist.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.