The man is an artist named Ra Paulette. He has created caves from sandstone hills in northern New Mexico. One of the caves is at Origin, where my daughter, Holly, works. They have an Origin Art Cave Tour.
The image above is from a piece on CBS Sunday Morning, and you can watch it here, on Ra Paulette's facebook page, or maybe at the CBS site if you're in the U.S.
Pulling a wheelbarrow behind isn't so easy, so I'm guessing it was empty and he was running or trotting along. I could be wrong. (Keith says "depends on the wheelbarrow.")
Here he is posing with it: