Michelin is the only tire I'd put on our Motorhome. The first set lasted a few weeks shy of 7 years ownership, those were the LTX M/S. The DOT date put them at 7.5 years old. I planned to replace them in April, but we had a blow out on the inner dual and replaced all 6 two weeks earlier than planned with LTX M/S2. The old tires had 30,00 miles on them and would have easily gone another 30,000 if they weren't so old. Plenty of tread left.
When we had the blow out, the tire lost most of the tread. The motorhome handled just fine. It felt like I hit a pot hole instead of having a blow out. The only reason I knew it was a blow out was because I could hear the tire shreddings hitting the motorhome. I hit the brakes and pulled over like nothing happened. I've seen what happens when other motorhomes have had blow outs of the inner dual tire that weren't Michelin tires.
The XPS Rib is an excellent tire, but was too expensive for us. If we had a bigger/heavier Class A, we probably would have went with the XPS Ribs. The Goodyear G614 is a very good tire as well as the BF Goodrich Commerical T/As. If I couldn't have gotten the Michelin's the BFGs would have been my second choice.
-Michael