Some great advice proffered here, once again as usual, Steve. My only addition would be that if Les Schwab installs your new Michelins, I'd be sure that particular store is using the best available computerized balance machine available within the company. And keep taking the coach back if vibration exists.
Our coach had vibration issues right out of the gate at Bend when new. BCS techs discovered a couple of issues in the front suspension, fixed them, and then sent it down the road to the Redmond Les Schwab (their usual alignment and balance resource) for checking. Les Schwab rebalanced the front wheels, but some vibration was still evident.
The Bend Goodyear dealer alerted me to an issue Monaco had with Goodyear tires, supposedly out-of-round, but actually mismounted by Monaco. Goodyear had me take the coach to their Portland Service Center where they have state-of-the-art balance capability. They found the tires not mismounted nor out-of-round, but the Les Schwab balance way out of whack; they removed the unnecessary oversized lead, and rebalanced the front wheels for me for $75. Unfortunately the coach has had to remain parked since, but the 20 mile jaunt home from Goodyear revealed no noticeable vibration, and we look forward to our first full trip with a coach that finally floats down the road as "smooth as a Cadillac", as we used to say.
As much as I've had several decades of good results with Les Schwab sales and service at stores from Clackamas to Twin Falls, I offer the above word of caution. That's my story and I'm stickin' to it.
-Joel