It depends on a lot of variables as to whether it would be easy or tough to sell one. If it is at the beginning of the local camping season, it would be easier to sell off than at the end of the season. Buying a lot would be similar to buying in a heavily-HOA restricted community.
As for where to get one, it depends on where you want to be, and what potential issues you want to deal with. For example, Florida generally doesn't have earthquakes, but the desert Southwest doesn't have hurricanes.
Oh, welcome to the forums.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.