Yes, stock the cars. Have warm clothing, an extra sleeping bag, snacks and water just in case. A small shovel and a traction mat for getting unstuck. I have to get those again but the ones we had were metal and unrolled, you stuck them under the tires and drove up and over the ice. There were a few times they saved my butt as far as getting out of the ice, even for other people.
Mind you where we are now, we also have to keep a shovel in the house and stock extra meals for snowed in weather, there's been times that the only way to get around is on snowmobile or foot, because the drifts get so big that they stop anything including big 4 by 4s. Last year some guys rode their snowmobiles through town and damaged quite a few minivan roofs not realizing they were under the snow. LOL