People have started having trouble with premature dry rot on the Michelins in the last few years. Several have started buying Toyos and have been very satisfied with them. We purchased a couple of Continentals last year through the FMCA plan where they were almost 150/tire less expensive than Michelins and have been happy with them so far. I will replacing the four Michelins on the rear this spring and will most likely get Continentals again.
You don't normally wear out a motorhome tire out but replace them due to dry rot. I won't know how the Continentals do, dry rot wise, for a few years yet.