I was once in a town about 30 miles down river from me and chanced to meet this guy in front of the Library there. He had a white Dodge Van with ladder racks on top. It wasn't a high top. I asked if he was living out of it and he hesitated to answer. I quickly told him about my Van and how I could travel and live out of it and so on and he opened up.
Yes, he was and opened it up to show me his outfit. Much like my first Van.
What I noticed he had on top toward the front was a yellow flashing light. (about 10 inches tall and 7 inches in diameter) When I asked him about it he said it gave an official look to the vehicle and most people didn't question it. Figuring it was official. The van looked like it could be a service vehicle as it was clean, well kept, and just bland. I noticed he was clean cut and wearing what looked like work uniform type clothing.
In the couple minutes I spoke with him I could see that this was his way to roll. I didn't ask any questions of him but did tell him about the CRVL forum.