Tire Replacement

A 265/75R22.5 is the same as Michelin's weird 255/80.

I have been very happy with Hankook and Toyo. Both seem to have a good reputation and I don't recall seeing any negative comments about either tire.

It seems that most negative comments revolve around Michelin and Goodyear so you might take that into consideration.

Genuine Chinese without paying for a name and Korean Hankooks to pay a little more for a name and an excellent reputation. They all have a DOT number on them, if that means anything at all.

Many replace with something other than Michelin and go with a 275/75/22.5 which is the same diameter and a little wider. FMCA has a discount program on Michelin and I use this seller on Ebay to compare prices.
I was surprised to see buses in Spain this fall with Triangle tires... made in China on them.

Check out Hankook tires. Get good reviews and decent prices.

First some cracking on the side walls of Michelin tires is normal. What is the production date of your tires? Being your unit is a 2010 I'd guess the production year is 2009 or later, making the tires about 5-6 years old. First go to the Michelins commercial/RV tire site and look at what Michelin considers acceptable for side wall cracking and then go from the as to the need to replace the tire now.

Much the same, would check with FMCA if your a member and get the discount pricing for the Michelin tires, they will direct you to a truck tire shop, Many foks have gone that route including myself, still somewhat expensive but a lot less than the regular pricing.
Dave M