Follow-Up:
I have non-rated Michelins on my rear after the crap you have to go through and the time it takes to get the Continentals, they now have apx.30,000 miles on them and have been fine, my front tires are now Uniroyal tiger paws, they also are not rated for the vehicle, and have apx. 5,000 miles on them, all of these non-rated tires are wearing better than the "rated" Continentals ever did, the original rear tires lasted about 35K before disintegrating, literally, on the road, I drive my Rialta at least 40K per year, tires were a problem, that problem has been corrected, I don't buy (and wait months) Continental, when I originally contacted Winnebago about the delivery of tire problem they said they were aware of it and had purchased a supply of them from Continental...after apx. a 2 month wait from Winnebago, I gave up on them also!