Spoil Campsite is a free, developed campground offered by South Florida Water Management District. It's one of five campsites located within the KICCO Wildlife Management Area (WMA). This particular campsite is large enough to accommodate several full-sized RVs, with plenty of room to turn-around.
KICCO Spoil Campsite requires driving through the River Ranch Resort. You may encounter a guard shack, and they will let you through if you tell them you are headed to this campsite.
Camping at all facilities operated by South Florida Water Management District requires a Special Use License which is free. You can get one online here.