I went from 16's to 19.5's on my F350 SRW. I have 265x70x19.5 tires that are a bit of an AT tread. They are very heavy duty sidewall, and fit my leveled 2002 F350 with no rub. They are a 34" tall tire. Reduced my sway by a lot!
I just bought an f700 box truck that came with 22.5 rims and tires. They are much larger, though both have very thick sidewalls (almost an inch thick sidewall!)
So having close view of both, I would stick with the 19.5's since they are a bolt-on. Any adapter to enable the use of 22.5's would add strain to the bearings not even factoring in the added weight.
Hopefully that helps in your decision making.
Best regards, Garry
