Goodyears vs Michelins
Last year I replaced 4 tires, 2 on the right rear and 2 on the front. I went with the Goodyear G-159 8R19.5
Last week I went to have the last 2 replaced and found that Goodyear no longer makes the G-159's.
The dealer wanted to sell me the G647 RSA instead. Upon further investigation, I found that Goodyear does not recommend these tires for class A Motorhomes, for reasons unknown. I told the dealer and he freaked out, since it was a conflict of information given to him by Goodyear.
The tire recommend by Goodyear for a class A (G670 RV) only comes in 225/70R19.5 and not 8R19.5. The 225's require a rim width of 6.75" versus the 6" rim width of the 8R's.Also the tire is 1" shorter, reducing your ride heights by 1/2". So running 225's was out of the question for me, which left me with no tires available from Goodyear.
Instead I went with Michelins 8R19.5 XZA's, had them installed on the front, with the 4 G159's running in the rear.
Today, I went for an extended run and can hardly express the immense difference in ride quality and handling with the new michelins on the front axle.
Just my personal experience for what it's worth.
1983 310 Classic Motorhome
1997 30' Excella Trailer