Jeff
I have run Michelin, Goodyear, Bridgestone, Sumitomo and now Toyo tires on my various motorhomes. I like the Toyos best. I have the M144, but they do not make that tire in your size. For your application, I would recommend the M154 load range H in 11R22.5. I would assume that your coach has 7.50 inch rims, so that would preclude going to a wider tire. If by chance you have the 8.25 inch rims, you could consider going to a little wider low profile tire like the 295/75. The 295/75 is probably the most common truck tire size on the road today. In either case, I would recommend going with the load range H even if your coach came original with load range G. Coach builders used the minimum tire rated to carry the weight. It is nice to have a little extra capacity and the H tires cost just a few dollars more than the G rated tires.
Richard