After reading all the comments and suggestions, I have decided to stick with the 295/80 tires all the way around on my coach. Thank you all for your input. Today I checked on the Michelin Tire Advantage program to get a cost on the 295/80s. The closest dealer is 40 miles from my house.
The initial price the dealer gave me did not sound too bad. But then he added the federal tax and sales tax and his charge of $60/tire
mounting and the cost quickly increased by over $100. I expected the taxes, even though I don't understand the reason for the federal tax, but $60 for mounting seemed out of line. My local dealer charges $20 for that same size tire.
Any savings from the Michelin program were just about wiped out by the dealer charges. Have any of you run into this problem?
I can pick the tires up from the dealer and have them mounted here but that just adds to the hassle.
I would tend to agree that $60 just to change the tire is a lot of money. However, if that charge also includes new stems and spin balancing before mounting it's not quite as bad.
The other thing that you might ask, or try to negotiate with the dealer is a credit for your old tires. In my case the dealer gave me sufficient credit for the old tires to cover all the stems, balancing and mounting, as well as a front end alignment, but not the taxes. Even though the take-off tires were old and not so safe for an RV they still had plenty of tread and the dealer made an off-hand comment that he could make a little selling them to gravel haulers.