The stock all-season Michelin's were no good in the snow. :no:
Get a good set of snow tires and you should be fine. The favorites seem to be Bridgestone Blizzaks or Michelin Latitude X-Ice. I got the Blizzaks due to the raving reviews from fellow LX owners and had no problems driving last winter.
Don't wait too long into the season to purchase winter tires. Since there is a limited selection of winter tires that fit our cars, both tend to sell out for the season. Of course, this depends on how severe the winter turns out and if a good sale price happens early.
I have the Blizzaks, and I'm entirely happy with them. And, they're not too much of a compromise for day-to-day driving. Just don't keep them on when it warms up, as "winter" tires are designed for cold temps.
It's most convenient to get extra rims to mount them on, so you can swap yourself. I'd never want my tires to have to be mounted / remounted all the time - expensive, and I wouldn't trust the wear and tear that would cause.
I don't have it with me and I'm too lazy to search it right now, but there are part numbers for the steel rims (cop rims), TPMS (tire pressure monitor sensors) and the lug nuts and center caps if you choose to use those too.
Other useful items: a good floor jack (don't forget these Chargers are 4xxx pounds, sorry I don't know the metric weight), jack stands (at least one), a torque wrench for 110 ft/lbs (sorry, again I don't know the metric measurement), and some better than factory lug nuts. I have a box of Gorilla nuts ready for the next time my factory rims go back on - I'm too nervous the factory nuts will not hold up to repeated mountings / dismountings.
Any alternative meanings to the words used in this post are purely coincidental. 