FYI, it's not a problem to ride on on fire roads, rail trails, dirt roads, gravel paths, etc. with a road style touring bike with beefy tires. I've done a few hundred miles loaded on my 520 with Conti TravelContact tires, and more with some other tire that was basically a road tire. As long as you aren't doing anything really steep and technical, it's fine. Of course, I'm little, so my wheels do have an advantage over an XL sized guy.
Oh, and 22x32 is a lovely gear for touring. 26x34 is not as nice, but it should get you up most stuff out west. 26x32 was not so nice, for me. I had to swap that out in New Zealand, where they build their roads steep.