I don't believe Toyo has an all-position highway (regional, urban, long-haul) in that exact size. I think the only tire they make in the 275/70R22.5 size is the M320 which isn't recommended for motorhome use.
I'd recommend the Sumitomo ST719. It's an all position very well-rated tire and has had very good reviews from motorhome owners. It also is priced very reasonably compared to a first tier tire like an equivalent Michelin, Bridgestone, Continental, and even should be priced lower than a Toyo should they make one in that size.
I also like the Yokohama RY103 (only available in load range H or 16-ply rated, I believe) or the Hankook AH37 but the Sumitomo is priced quite a bit lower and has a load range J or 18-ply rated.
The ST719 represents a great value in my opinion. I'm not sure if they are manfufactured in their plant outside of Buffalo New York yet or not (many of their commercial truck tires are now made at that plant) as somebody on the forum recently posted that the ones they received were made in Japan but no matter, you'll get a Japanese-engineered tire for a great price whether it's made at their plant in New York or if it comes from Japan.
Motorhometires.com (an iRV2 sponsor): Sumitomo ST719 - 275/70R22.5
And doing a quick search, the best price I could find is at Tires-easy: Sumitomo ST719 - 275/70R22.5