I think that this is pretty cool personally. My bestest buddy and I are planning an adventure that requires us to hike or bike into an area that has some very cool historical interest to us. If we bike - it will take us less time to get there, however, we would not be able to carry much more then a day pack each. If we hike - more travel time but able to carry everything. I might try to build one of these carts and see how it does.
I figure I have all but the conduit in my garage and worst that could happen is that I waste a day in my life by trying something new. At best I will look like a yuppy suvivalist geek that borrowed his neighbors bike kid carrier and got lost in the mountains.
I will let you know how it works out for me. Provided that I dont get laughed off the mountain by ranchers with a meth problem.
EPI
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A government big enough to give you everything you want,
is strong enough to take everything you have.
Thomas Jefferson