I ran into these guys at the gap. I got to check out their trailers that they are starting to manufacture. I think they run about $2k. They look pretty good, they say it makes the bike handle like there is about a 100lbs passenger on the back. From the design, the whole yoke part comes off the axle in the matter of seconds and the trailer is free (don't forget the wiring).
Third Wheel Trailers...
Third Wheel Trailers...