Hey all new to site so little patience, please. <img src="/images/graemlins/grin.gif" alt="" /> I have two small children 1yr old and 3 yr old and have beed thinking about the same problem. The cart idea is what I have come up with also, but make it your self so it is a little thinner and put a couple of large tires (solid - no flates / 14 " tall x 4" wide) on the back so so it is a sled with two wheels. With the large tires it can go off road fairly easy and being thinner can squeeze between the tree. Plus nice bounus is strap your pack to it and it spreads the weight.
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