I should clarify - my Rohloff should come with the OEM2 fitting and a Speedbone disc mount torque arm. So it should work in any frame with disc mounts, ideally with a split-shell EBB instead of track ends.

Morgan, thanks for the link on the alternative Burley hitch, I didn't know that existed. I think I might need that if I go with the Tweed frame as well. The Tout Boulevard looks very well thought out, and great value. I'm not going to be touring with this bike though, just commuting, so I want something with relatively twitchy and exciting geometry.