We stayed at Camp Lake Jasper, near I-95 Exit 8 in South Carolina. It was nice, quiet and clean, but not a resort type. We were there to visit Savannah Wildlife Refuge, Tybee Island, and the city of Savannah, so we weren't there much during the day.
I highly recommend visiting the Eighth Air Force Museum at I-95 Exit 102 in Georgia. It is very well done. There's a lot more to see and learn than just airplanes.
Camp Lake Jasper
Home @ the Mighty Eighth
A few years ago we stayed at the Hardeeville RV park. It was fine, but it's a little harder to get to than Camp Lake Jasper, and it seemed to be harder to get to Savannah from there. Camp Lake Jasper had nicer bathrooms, etc., but otherwise there wasn't a lot of difference.