Where in the world will you be for it to get to -40? You gonna drive to antartica to rescue those dimwits?
In an emergency keep a bag of charcoal an old pan and charcoal starter. Light the charcoal in the pan and when the flame goes out and you have a pan of hot coals, slide the pan under the engine block for about an hour, then crank you truck.
Obviously someplace where the Global Warming is totally out of hand.