We (for past two winters) shoot straight down to Florida from Montreal region in 2 long days (staying part of Jan and Feb. i do all the driving myself, via I87 to I287, then the I95 straight down. We do extreme detailed weather forcasting, and view all live interstate cams right up to the second we leave. We have never encountered a flake of snow, and plan dry roads door to door. From quebec, i make it to Camp Springs (DC). On day 2, i am in jacksonville, FL. We go between the most brutal snowstorms you can imagine, because the road surfaces dry up very fast on major Interstates. I also have live link satellite gps, with real time road conditions, traffic, and avoidance system (the top of the line My Ford Touch nav system, with every option, 2014).
The trick is to avoid as many cities as possible (why i use I287). You are driving through Mass? You should be able to do same destination as me (or, enen North Carolina) IF you completely avoid winter precip. If you hit winter precip, all bets are off. Wait for dry interstate, and continue.
The only open campground in the north during winter is the KOA just south of Woodbridge, VA just off I95, as far as i know. The next one you will hit is in St Marys, FL (just north of Jacksonville). Never needed reservations during winter. Oh, we always hotel it in Camp Springs (near Andrews Air Force Base) because it is usually around 10F at that time of winter.
Hope this helps. One other: if you don,t have traffic avoidance electronics, you may luck out on your ETA (a random chance, impossible to calculate traffic accidents!).
We will be heading south again next winter about 1.3 weeks before you.
Cheers,
S-
Silver
2004 Chevy Silverado 2500HD 4x4 6.0L Ext/LB Tow Package 4L80E Michelin AT2s| Outfitter Caribou