There's one in east Palatka over the bridge. No idea the name. Otherwise, several down in Welaka. We've spent months at Welaka Lodge over the years, and there's a co-op park at the south end of Front St. (I believe) at which the owners often rent out their sites, Lazy Days RVP.
at Crescent City
Half Shell Resort, LLC - Welcome to Half Shell RV Park and Marina
about in San Mateo
I've only driven by the park in East Palatka, didn't look like much.
Welaka Lodge is nice but may be a bit tight; we get in at 36'MH. Half Shell is older and tighter. Trail Boss looked like it was maybe out of business or not a few years ago. It think it's just been let go.
Welaka has nothing in town, so it might make more sense to be over in Crescent City where the civilization is.