Be sure and put the one remaining "old" tire on an outboard position on the rear, where it will be easier to change next time. Actually "easier" is a poor description. As Baja Man noted, his roadside assistance would not do inboard wheels, but its no harder than the outboard......... But if nothing else, will allow you to keep and eye on it during your travels.
Michelins are noted for premature sidewall checking, not just RV or truck tires, they all do it. My local, family owned tire shop won't sell them due to this.
Charles