GSMNP is open again. NC and TN are footing the bill right now.
http://www.usatoday.com/story/news/nation/2013/10/15/great-smoky-national-park-reopens/2990561/
However, if you are looking at coming in December, I'm not sure if any of the official GSMNP camping areas are open. I believe most are seasonal and close sometime in November. Is the GSMNP website down? If not get on there and check which campgrounds are open during that time.
Another suggestion, would also be the mtns of NC such as Beech Mtn, Grandfather Mtn, Sugar Mtn, Banner Elk, Linville area. Grandfather Mtn is now a NC state park. If the Blue Ridge parkway is open (gov shutdown, and it closes in bad condition) it has some of the best views in the area. There are also several places to camp just off the Parkway.
I will warn you though that the past few years we have not had a lot of snow in East TN or West NC. And the snow we have had has come after the first of the year. I know we are hoping that changes this year as my kiddo loves some snow.
If you have 4wd, know how to use it, and don't drive like a maniac, you will be fine. I've lived in Western NC and East TN for a combined 10+ years and never had to use chains. 4wd is always nice to have, and if you are in some of the remote areas you will need. If you are in some of the more populated areas roads will be pretty well taken care of and cleaned as soon as it begins to flurry. Just take it slow and you will be fine. A lot of people think just because they have 4wd they can drive balls to the wall wherever they go, or drive their vehicle just like they do on dry normal roads... Not so.
Also make sure you have proper recovery gear in your vehicle and you will be fine. Tow points, tow straps, etc. You know the common things you take when you are fourwheeling. Plus a shovel, bag of kitty litter, and make sure there are blankets, food, etc in the vehcile should you get stuck. Maybe a CB depending on how remote you are going.
Lastly, if you are going to be up here, shoot me a PM and I'll give you my number. That way if you do get stuck somewhere you'll at least have one local yokel to come help you out. Plus us Jeep guys never get tire of rescuing stuck Isuzus...![](/media/img/icons/smilies/wink-18.png)