Michelin rep at HQ and dealer both stated that the XRVs offer a "better" ride for motorhomes and lower heat build-up vs the XZE. If your original tire is a 235x80x22.5, the 255/80R22.5 is quite different: 235=555 revolutions per mile. 255= 538 revolutions per mile.
Just replaced my "timed out" (8 years) XRVs with same size XRVs. Man, that tread looked good, but I don't need a tire self-destruct at 65 mph !