It looks like one of these babies could work great for the packrafter that wants to carry more gear on long treks. It would probably strap on much better to the bow of a packraft than a bicycle I think. I want one of these because I am a homeless by choice packrafter and want to carry more gear and use the rivers more for transportation routes in addition to just adventure. I can just pull my gear behind me between rivers.
http://bicycledesign.net/2010/04/monowalker-hikingcycling-trailer/
Many years ago I was following a really weird ski track in the Oregon Cascades when I caught the guy leaving it. He had a pole pack product he was developing that was designed to be pushed, not pulled, when walking. Pushing seems likely to me to be easier on the body than pulling with the hands. Checkout http://www.polepackhiking.com – probably the product I saw. Beware that use of wheeled devices is prohibited in Wilderness Areas.