Oftentimes, bears aren't the only ones tucked away snug for the winter, peacefully awaiting the forthcoming spring thaw. In the colder regions, many of our cars are also subjected to hibernation.
While I believe in "all-weather" hot rods and customs, there definitely are times—and more importantly, places—where it's just not sensible, if even possible, to drive vintage vehicles. Beyond the dangerous road conditions, which in themselves are enough for me to keep a bias-plied, drum-braked car/truck locked in the garage, the effects the seasoned (salted) blacktop have on the structural integrity of said vehicles is highly undesired all in itself.
So, in situations as such, it's not just a matter of baby, mama, and papa bear finding a cozy cave and calling it a winter. Veterans of the practice know there are routines in which to follow before tucking their rides in for the season—routines that have a major affect not only on how your vehicle manages the cold-month downtime, but how they respond to the pending spring revival.
Obviously, fuel is of utmost concern these days. Personally, I'd forgo the additives altogether and completely drain your tank/system. We're not dealing with Weed eaters here, we're dealing with costly components. (Your other petroleum-based fluids shouldn't require similar attention.)
Depending on your particular electronics setup (computer-wise), address your battery accordingly. I always disconnect for long-term storage, using a trickle charger to maintain the battery during non-use. (Check your battery manufacturer's specific recommendations for storage.)
To avoid any possibilities of bias-ply tires flat spotting (something I've never experienced personally), you might want to consider taking the weight off the tires by supporting it with jackstands or other "safe" methods. If not, keep an eye on air pressure during the storage months.
Accommodate your car to its particular surroundings. If it's damp or there's any tendency for potential outside leakage, cover accordingly. If there's any likelihood of rodent visitation, prepare adequate "distractions" (I'll leave those to your imagination). And if you're like me, do not use said stored vehicle as a device to store other objects on top of—or for that matter, anywhere near, especially if you have kids or pets in the vicinity!
There's nothing much worse than awakening a hibernating treasure just to find out it can't be immediately put back to use owing to neglect, damage, or what have you. Do it right; drive it right away.