I was looking at articles about the homeless in Seattle. One of them had a photo of an old boat tied up under a bridge. Lots of tarps covering it and clothes hanging to dry. Probably not what you were thinking of - but I would take that over living in my car. Although from the article, it sounded like they are much stricter in enforcing the marine rules (illegal mooring, etc.) than they are with parked cars.
Ha,,,no, not what I was thinking.
I meant the more traditional houseboat on water, traveling up the Mississippi and beyond.