Interesting design, but it looks like your back and arms would get a lot more tired than using an old fashioned wheelbarrow. The motion is all bend and lift. With the heavy load his design has a longer lever to minimize bend and lift force while doing your work through more distance. Its interesting, but I'm not going to give up on the wheel yet.
If you could get it to go up stairs, that could be valuable some places. I am not giving up the wheel just yet, either.
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