Lot of people full time by choice. When I got a seasonal site on a lake up North 14 years ago I had always dreamed of a cabin on the lake. I quickly realized the expense and maintaining a property for a few months a year wasn't worth it, so I went the seasonal route. The only thing I'm responsible for is the RV. Water, Sewer, Trash, Electric, Property tax, Yard work, and Roads are all maintained by the campground. I know a couple of seasonals there that have a spot there and one in Florida for the Winter and sold their homes. Even with my very modest home paid for I have property tax, insurance and utilities that amount to over 600 a month then add in maintenance on top of that. It would be financially better for me to get another spot in Florida or Georgia and get rid of the home. I just can't do it at this point. I have found the Collies and I can live in a RV very comfortably. Other then the seasonal I keep a couple of RV'S to travel with.
With the large expensive of a home and the fact a lot of people can now do their job from anywhere campgrounds are filling up with young people as well as retirees. This makes it more difficult for Weekend Warriors to get spots.