A heavy-duty jumpstarter. Quicker and easier to use than jumper cables and allows for self-rescue, and very handy indeed at CERT callouts for recharging laptops and smartphones.

A small inverter — I often road trip with coworkers who are working on their laptops while I drive, or sometimes I’ll want to recharge my laptop (but not use it!) while I drive.

The biggest and baddest snow brush/ice scraper I’ve ever seen available for sale. PSA: get the snow off every scrap of glass, off the hood, and off the roof. Blowing snow off your car into your own face or into the faces of folks behind you is no good.