[1] https://www.reddit.com/r/IAmA/comments/4iqo3g/im_the_guy_wal...
Does your friend also cite Hobo Nick as inspiration?
Long back I had read an article or series in National Geographic about an American who did that - walked from coast to coast. Great story.
> Walk Across America is a nonfiction travel book first published in 1979. It was the first book written by travel author Peter Jenkins, with support from the National Geographic Society. The book depicts his journey from Alfred, New York to New Orleans, Louisiana. While upon his journey of self-discovery, he surmounted the travails of travel, engaged himself in others' lives, lost his best friend, experienced a religious conversion, and courted a new wife.