One thing I haven't seen mentioned, is something to drive over to get traction when you're stuck in snow. Digging yourself out with a shovel can work (sometimes), but it's often times a lot of work. Especially when the snow under the tires has been pressed/spun down into a block of ice by your spinning tires. Something simple like some old strips of carpet, or even your cars floormats (if they're not expensive!) can be jammed under the front of your tires and driven over to gain traction. They even make commercial things that work on the same principle, but old carpet strips work fine in the few times I've tried it, and they're usually free. A bucket full of kitty litter can be sprinkled in front of your tires too, to help with traction (you have to make sure you get it spread as far back under the stuck tire as possible).