those who have experience with the surly long haul trucker frame: what is the most appropriate frame size for someone 6'0"? it seems like the choice might really be between 56, 58, and 60 (all with 700 wheels). should i give an inseam measurement? thanks!

Get an inseam measurement in cm. Use Rivendell's guide. At 6'0" I'd say your probably on a 60. The LHT has a lower BB. I'm 6'1.5" with a 91cm inseam, and I fit the 62 just fine. A 60 should put your bars at or slightly above the same height as the seat, which is where it's most comfortable.