When I went looking for tires I found only one manufacturer (Michelin) that made them in the size I needed (305/70 22.5's). They are the only tire that had enough weight rating and would fit the wheel wells, even so I have to be sure the tires are pointed straight ahead when I dump the air. I went from a 275/70 so size was an issue.
Continental listed that size but they were not yet in production and no idea when they would be.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey