Learning from others experiences is what the sharing of information is all about. After reading of a man that went off the side of the road and was trapped in car for days as people drove by- I picked up a mil contract strobe, put it in a strong nylon pouch closed by fastex buckle and strapped it to one of the poles on my drivers side head rest.
Sounds like this family did well and I am very glad to hear that they are OK.
My winter changes for my car kit are addition of: boots, M65 field jacket with liner, balaclava, wool socks, gloves, 3 extra road flares, 10' of logging chain with hooks, steel square point spade, 10X10 blue tarp, 1 gallon cat litter pellets and an axe.
Regular gear of use but not limited to: 1 gallon water, roll of duct and electrical tape, plastic sheathing, Ruger KMK512 and 50 rounds, handtools, paper towels, 3 road flares, orange vests, flashlight/headlamp, 2 quarts Gatorade, 1 box cereal bars, rope, car GPS, jumper cables.
Bill