What ever you decide to do, also carry a shovel, preferably full size handle. A little shovel work will help when you dig yourself in, chains, lockers, doesn't matter - you will dig yourself in.
I was surprised I had to get to page two to see a shovel.
I've lived in canada my whole life, and if you have a shovel you can be saved often.
Like many have said, use momentum!
Even if its slow, you're still moving. No need for wheel spin.
If you do get stuck:
Rock back and forth without spinning your tires.
If it's an auto, just put it in drive then in reverse a couple times no gas.
After that, keep rocking but with a bit of gas.
If you build a little runway of traction it can get you going (to your next stuck spot haha).
Good luck! Winter wheeling is a lot of fun.
PS a friend is the ultimate if you're going anywhere sketchy.