Travoy seatpost hitch...
http://www.amazon.com/gp/aw/d/B0073R...p_s_a_1&sr=8-1
Burley flex connector for round tube(what I used)...
http://www.amazon.com/gp/aw/d/B001GS...7303546&sr=8-1
Burley flex connector for square tube...
http://www.amazon.com/gp/aw/d/B001GS...7303546&sr=8-2
I'm still in the testing phase. I found a dry bag backpack that fits pretty good and still allows me to use as a backpack.
One piece of advice is to keep most of the weight towards the bottom. I'm trying to figure a way to lock the stem in place when using, to allow more weight up top.
I also modified my original mounting of the axles...using the original hole location caused the plastic to flex with heavy weight. Ill post a picture of this when I get home.