I have a cherished "NuBarro" wheelbarrow that has a big green plastic ball for a front wheel. That ball is almost 2 feet around, and it rolls over narrow trenches and very soft soil very easily. And it goes over bumps and rocks fairly easily. Pulling is still easier than pushing.
Apparently the design used to be called a "ballbarrow" which is a good description.
When I went looking for another, they were no longer being made.
Here's all I've found:
http://toolmonger.com/2009/04/...
