This subject has been just about beaten to death on this and lots of other forums. You can do a search on just about any of the major forums that has a functional search engine for XRV or any other Michelin trade name and you'll get blown away by the number of complaints. Michelin has a serious problem and either doesn't know how to fix it or the fix is so expensive they can't.
(After you've blown several megabucks on the development and marketing of a line of tires you can't discontinue the line without admitting that there was a problem and incurring all sorts of liability suits or admitting to the stockholders that you screwed up. If you do, the company loses a fortune and you lose your job!)
Judging from what I've seen on these forums, we're told to adjust the pressures in our MH tires according to some published values based on the axle weights. When a lot of folks follow those tables they end up with blown tires anyway, with the side walls "unzipping," i.e., a split forms that parallels the circumference of the tire and lies somewhere about midway along the sidewall most or all of the way around the tire.
When they take the blown tire to Michelin, they're told that they were running their MH overweight and it's not Michelin's problem. And, a lot of these folks also obsessively, compulsively, anal retentively weigh their rigs and adjust their weights to make sure that they *NEVER* run overweight and they often keep a log of their pressure checks to prove it. But, the tires blow anyway!
The majority of the recommendations are to switch to some other brand, with Goodyear being the brand most commonly mentioned. The problem is that many of us have MHs that seem to be custom built around Michelin XRVs and can't switch without a major cash layout and remodeling job.
So, as an interim solution to the problem we've adopted another strategy and it's detailed on http://www.woodalls.com/cforum/index...d/14570339.cfm
. (YOu can copy and paste the link. If it doesn't work get back to me by private E-mail [firstname.lastname@example.org] and I'll E-mail you a text version.) Look it over and see what you think.