I did a bit of searching and found the answer to my question.
Now a new question, which I hope will receive some informative answers...
We have the XRV 235/80R 22.5 tires, and will be replacing them prior to this summer's travels. Our coach was built on the heavy side for a W22 and we run right at our weight limits. However, I see that they are using the 235/80 tires on the W24 chassis, also, which reassures me that we aren't overloading our tires.
We will probably just replace them with 235s, but, in light of the ongoing controversy about the XRV tires, what other tires should we consider? Would going to the 255/80 tire size be overkill? I have also seen Goodyear mentioned in other posts... any suggestions?