Just a general comment about coaches out of season. Easier for those not living in weather conditions that prohibit this....
All coaches will do better if they are regularly exercised. Part of that exercising, is getting the tires out and up to operating temperature. All tires, yes even the Michelins that are so often mentioned with cracking problems, will be happier and benefit from this exercise.
As well as the coach, generator, AC - OTR and Roof Top, furnaces, hydro/aqua hots, OTR heaters, water pumps, etc. - all benefit from usage. Seals don't dry out, generators don't acquire condensation, etc., etc.
A every 4-6 wee 60 minute get out and exercise the coach and systems, will also improve the health of any tire.
OK - So Michelin thread. And yeah, I've had only three sets of tires over two coaches in 12 years now - so I'm a rookie compared to you veterans. (Bounder, 19.5 Goodyear G670's. Country Coach Michelin XZE*'s, lost two tires to a pothole and had to go with BF Goodrich ST230's due to the tire shortage of 2015, and now recently added 6 more Michelin XZA2's.) So as of now, I'm a Michelin tire user, and feel safe and comfortable with my choice. That being said, I do feel other good quality tires are available, usually, but not always, available at lower price points.
But, I did enjoy riding our bikes around the Yuma Foothills in March. Passed a current 'rustic charmed' not so gracefully aged Executive coach (Complete with tarps with holes over the rear bedroom area, to set the picture. And of course, a residential widow unit AC hanging off the side of the coach too. Propped up with some wood rotting 2x4's.) I could see the front passenger tire. It did have air in it, but we're talking rotted and cracked tires. Not close enough to see actual manufacture of the tire, but laughed at the silver painted name of "Michlin" someone had wrote on the side of the tire...
No question that Michlin had their zipper failure tires, and also a brand or two of tires that were prone to surface cracks, or worse. We have many posters that have shared their problems on relatively young Michelin (Or should I say "Michlin" in this case
!) tires that had trouble with Michelin on resolving compensation. Some other good posts, like here, where some have had good success.
I had about three to four days of on/off again conversation with a TCI Tire Center in the Denver area, as we were trying to locate Michelin XZE*'s replacements for more two pot hole damaged tires. (They did not blow, and IMO, a less stout tire could have ruptured, so no complaints on how they survived the impact of this hard edged and deep pot hole at a pretty good speed. Yep, could not avoid it due to traffic, and did not see it in time to slow down very much due to the traffic ahead of me.) The Tire Professional helping me, who located some less then 6 months old ST230's for me and offered to split the costs on having them shipped to his shop. Became a gent that I shot the breeze with quite a bit. I asked him his thoughts on the Michelin tire cracking conversation. He said speaking for himself, that he could see it from both sides. Yes, Michelin (And other companies too.) did have some tires that had problems. He said that his experience while working with Michelin was about 50/50. If a owner had bought the coach new, and or added these tires themselves to the coach, he felt Michelin was more then fair on providing compensation. If a owner had bought the coach second hand, and thus has no fist had experience on the care and or abuse of the tires before they bought the coach. That Michelin was not as easy on providing compensation. In his opinion, this was fair.
He said that after a few decades of talking with RV owners, you could get a feel for those that just 'got in and drove'. Vs those that were hands on on the care of their coach, and tires, including proper inflation. If not evident by being on the valve stems, he'd ask if the coach had Smart Tires installed. That was another way he got a 'feel' for the care of the owner of the tires. One other observation, he was surprised by the owners that had no clue that UV was the enemy. No tire protection used, and or applied. (And yes, as he was inspecting all 8 of my tire for me, they were 5 1/2 years of age. He casually asked me questions about my habits for care. Asked if I had had a four corner weight, and my PSI practices. And knew that I used Aerospace 303. Which he commented he felt was cheap insurance for the exposed rubber compounds.)
So what, well, any tire that is run under inflated for the loads for periods of times. Or has clipped a few too many curbs or other items. Is going too be much more likely to have problems.
Look for me on the road, whenever I pass a flipped over Ford Explorer, I'm the one out writing 'Firestone' on the side of the tires... (Yes, Firestone did have some tires that were problematic, and undersized for the duty on the Explorers. But not all Firestones are bad.... And that is the way I feel about Michelin too
! All my opinion....
Best to all, and keep the rubber side down, and properly inflated, exercise your tires/coach - and have some fun!