I have used both Goodyear and Michelin tires on three different Holiday Rambler Endeavor motorhomes.
The first, a 2002 came equipped with Goodyear. I experienced severe "cupping" and replaced them with Michelin "steer" tires. No more tire issues with that coach.
The second coach, 2006 Endeavor, came equipped with Goodyear tires. I only kept that coach one year, had no tire issues in 12K miles.
The third coach, 2007 Endeavor, came equipped with Michelin. I now have 51K miles in six years, no issues. I will replace them next week with Michelin using the FMCA Advantage Program.
I belong to the Holiday Rambler Diesel Pusher Chapter 419 group. We have a great maintenance session rally each year. Tires are always a topic of discussion. Goodyear seems to have had a history of "cupping" and "rivering" wear patterns on the outer edges of the front tires. I haven't heard or experienced any similar issues with Michelin.
Personally, I will use Michelin and change them within the 5-6 year time period I feel comfortable with.
Larry