There are a few campgrounds here in southeastern GA that are popular with Snowbirds,
Coastal GA RV Resort and
Blythe Island Regional Park and Campground.
Coastal GA is a relatively new resort. The entire campground is asphalt and every pad is concrete. Most of them are pull thrus, however the sites along the lake and the property boundaries are back in sites. The owners are real nice (one of them lives on property). They have full hook-ups, cable and wifi (not sure if WiFi is free). Dish would not be a problem. They are less than 2 miles off I-95, but far enough away that road noise isn't too bad. $600/month.
Blythe Island is more like a state park, except they have full hook-ups, cable and wifi (it is free). I don't camp there, but I do fish there and get wifi on the parts of the lake near the campground and it works. Sites are dirt, but pretty level. Except on the edges of the campground, Dish might be a problem because there is a lot of tree cover. The staff is very friendly. It is about 6 miles from I-95 and is super quiet. It's on the South Brunswick River with great fishing and their is a small man made lake. $477.30/month.
Although night time temps can dip below freezing, it doesn't usually get much colder than that. I think we only had like 1 hard freeze last year. Day time temps are usually in the 50s. Some times warmer, some times colder. Mid-January to Mid-February is usually the coldest part of the winter.
Coastal GA RV Resort was pretty crowded last winter. I don't think they were full, but they were pretty close. Bythe Island Regional Park usually has plenty of sites available.
-Michael