For those of you making plans for a fall/winter trip south, Hayti/Portageville KOA in southern Missouri has a great deal running through March 31, 2006. For every day you stay at the campground on your trip south, they will match the days and give you 50% off the site rental on your trip back north!
The campgound is under new ownership (nope, I'm not the owner) and management so don't be taken by the old campground reviews posted here. The campground is centrally located within very close travelling distance to 5 states. Oh and they have FREE (in the comfort of your RV) wifi.