Looks nice - but the chainstays are only 419mm:
http://surlybikes.com/frames/troll_frame/
The Long Haul Trucker, by contrast, has 460mm chainstays. This is always the first thing I look at when I see a touring bike, because short chainstays increases the chances of heel strike on the panniers. And if you have to move the panniers back past the rear hub, then the more you do that, the more "tail wagging the dog" effect you're likely to see.
Neil