I would recommend michelin tires if you join the FMCA Family motor coach association you can get michelin tires at a discount nation wide. As someone else recommended you might go 1 load range heavier to help with the load. going a size larger might change your gear ratio and throw off your speedometer. I switched to the michelin tires and can say that I am very happy with them. you can put this in your for what it's worth category, but that's my recommendation. they are very smooth.
Dave Dahlem S/C & S/G