Thanks for the input, lots of good ideas. I like the Burley Travoy and the BOB Ibex Bike Cargo Trailer the best so far.

bikenh, I hear where coming from man but I have questions about hauling it on the back, three things, center of gravity, load shift and the bag hitting low things like tree limbs. I want to ride the trails at least part of the time with the pack, that's why I'm thinking of a one wheeled trailer, and low hanging limbs could be a problem. The top of my pack sits about eight inches above my head and that's with out the top bar extended all the way up. Trying to judge this in the woods or being able to lean forward enough to miss a limb could be a challenge. I can just see me flat on my butt on the trail because I misjudged something. Am I over thinking it?