Yeah, I’ve been in some pretty nasty storms here. I believe I will start working on getting items into the trunk of each car. Thanks for the tips.
For you, sleeping bags, tea candles, and hand warmers, snow boots and old ski bibbs and a cell phone charger should be the core for what you need. Add a fleece blanket for each bag if you have the space. (a fleece blanket inside of an inadequate sleeping is a very nice addition.
If you keep a supply of hand warmers then you can add one or two to the bag every 8 to twelve hours to greatly increase it's warmth, and since you will only be keeping old or cheap bags in the car then putting the fleece blanket and the handwarmers inside the bag will get you through the night if you can't run the car heater.
Buying some old ski bibbs from the thrift shop and stuffing them under your seat sure is nice if you have to walk and you left the house wearing cotton jeans or a pant suit.