For something kind of in the same vein, a youtuber Chad Caruso rode a skateboard all the way across America from Venice Beach, CA to Virginia Beach, VA:

https://www.youtube.com/watch?v=PsAOh89b7mE&list=PLVAaokG6re...

Some of my favorite clips were from early in the vlogs in the Southwestern USA like California, Airzona, and New Mexico:

https://youtu.be/UJ12FHCUMTg?list=PLVAaokG6re_rwP-h3gtJMG54C...

It would be really interesting if he literally mapped it — but unfortunately, he just wrote a book.

Tangential: I'm currently planning to create a set of GPX files for trail skating around my local city, including a description of the skating surface, traffic, safety, etc. to give an idea of how what experience level is recommended.

Skating is a great way to see the same local places from a very different perspective (than my usual driving through without paying any attention to anything other than driving / getting to the destination).

He didn't map anything.

He wrote a book, that's it.