Replacing my OEM Michelins as well, which are weather cracked on the sidewalls.
I'm finding that unless you have some unique traction expectations for foul weather, run the steer tires all the way around. I especially want the quiet-smooth ride.
Michelin = sidewall cracks, Goodyear 670 = rivering. No sense returning to tires with known issues and paying a penalty. The Goodyear Endurance seems to be highly rated and cheaper than the "made for stationary RVs 670". I also am hearing good on the Toyo, Hankook, and Continental. FMCA now offers discounts on the Continental, Hankook, Goodrich as well as Michelin.