Our daughter works from home via the internet but her job could easily be done by a traveling RVer. She sets up companies with their tax programs. Bass Pro Shop is a new customer for her.
She also puts in much more than 40 hr/week which is only what she's paid for. However, her hours are flexible so she can go to the kids' school activities and games.
If you go into an office building nowadays, you will see everyone on their computers doing their work. Very little paper gets passed around.
Working from a RV you definitely would not be using a park's Wifi. You'd need to supply your own and be in an area to get good internet connection.