One more idea. Why not just adapt a motorized electric wheelchair? They can handle a lot of weight and go faster than one can walk. I'll admit I prefer a backpack, and could easily handle an 11x14 or bigger on a game-carrying frame like elk hunters use. Anything with wheels is limited to smoother surfaces. But I do know someone who roller skates down steep dirt trails, so at least someone is crazier than we LF types!
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