Jasper County SC, the last one before you hit GA has no real regulations. Everywhere you see the a single RV on a lot, in some areas more than one.
Guys from Florida set up entire hunting camps, some without a single frame structure, just campers under pole barn.
People have a construction pole put up, then a shed or pole barn and then comes the RV. The local well guys, you pay them they drill and install the pump, same with septic.
There are also many old home sites with the house falling in or long gone for sale, people buy these and do the same. Most of these already have well and septic.
Chris