I replaced my xrv 255x80x22.5 with Sumitomo 727 tires in the 275/70R22.5 size. All the specs fit my rims and dual spacing. Tire is slightly wider, but best part is the new tires make 549 revs/mile where the old tires made 541 revs/mile, so the speedometer error is so small that I can't detect a difference. Checked both with the GPS.
The load range H vs the G's I removed gives more load carrying ability and/or the ability to run less tire pressure for better ride. Pleased so far with the tires, ride, and handling.
My purchase was in 2009, but you might want to check Sumitomo to see if the load range H is still available. My tires still look like new.
Fred & Vicki
Richmond Hill, Ga
2000 H.R.Endeavor/Freightliner/330 Cat