In winter here the roads can shut down on us for a few hours to a couple of weeks. It may be from wrecks or from slick or drifted roads. I've had several things in my vehicles not only because of these things, but because I spend a great deal of time out exploring in the desert areas even in the winter.
For my vehicle I usually make sure I top off the tank regularly especially if I'm going somewhere. I carried tire chains, extra oil, wipers, wiper fluid, a bottle or two of Heat, some deicer, tools, and recovery gear. I also had a Max-axe tool and a shovel. There was a dune flag and pole that could be attached quickly to help with visibility also. A CB with weather channels for awhile until I had to replace it and then I lost the weather channels.
In the backseat I carried a sleeping bag, a survival bag, a blanket, a food sack, water, a winter clothes bag, extra clothes, boots, shoes, hats, gloves, and some miscellaneous stuff.
The survival bag and a "junk" bag, contained, a space blanket, an emergency space blanket, and emergency sleeping bag, a couple of tarps, matches, a couple of different fire starting tools, a leatherman, a knife, a compass and book/maps, sewing kit, utensils, mess kit, small Esbit stove, a multi-fuel backpacker stove, a multi-fuel lantern, fuel bottles, a Sawvivor folding saw, a couple of folding buckets, a big roll of 550 paracord, some small hand towels, a small Coleman heater and a couple of propane bottles, sometimes a small bag of charcoal, flashlights, extra batteries, and a few things I'm probably forgetting.
The food sack contained 3-4 full meal MREs, 3-4 Mountain House freeze dried Entrees, a couple of the Mainstay Food Bars, several Datrex water pouches, a case of bottled water, a mix of MRE and freeze dried sides and desserts, and the sack was a Cabelas dry bag.
The winter clothes bag contained a parka, insulate bibs, proclavas, stocking hats, gauntlet style insulated mittens and gloves, wrist length insulated gloves, fleece gloves, Sorel Pac boots, extra socks, wool socks, a couple of sleeveless muscle tees to layer, a set of thermal underwear, and a fleece jacket and vest. In the warmer months this bag came out and a summer bag went in the had a rain parka, rain pants, a poncho, hat, gloves, and a couple of pairs of socks.
I also usually had a change of clothes with a couple of pairs of underwear, a couple of pairs of socks, 2 t-shirts, a long sleeve canvas shirt, and a pair of pants. A couple of fleece jackets, a pair of old tennis shoes, and a pair of hiking boots.
I had a Adventure Medical Comprehensive First Aid Kit, a smaller Toyota First Aid Kit, a Knuckle Mender Kit, and a separate bag with a CPR mask, gloves, hand sanitizer, and some heating pads of various sizes. In my door storage area I also had wet wipes, bug wipes, and sun block wipes. I had First Responder Training yearly at work plus some more advanced First Aid stuff from time to time.
On my person, in the console, or in my day pack I also had a couple more Leatherman, a couple more flashlights and batteries, and matches. I may also have a pistol and extra ammo and even a rifle and ammo.
I set things up not only for an emergency situation, but for the times when I may have taken a drive and then wished that I had my camping stuff so I could stay over. I also used to go out with my twin Nephews and their Scout troop a lot. I did the food so there were options of having things that could just be opened and eaten when under stress and then stuff that took a little preparation after things settled.
I think I could do pretty good in most cases with what I carry and what I know. I can't hike anymore so I would be staying with the vehicle so that led me to carry a bit extra than what would be normal. If it was a situation where the vehicle still ran and it was just a blocked road or something I also know several back roads in the area too that will take me from one town or area to another.
I still need to put a lot of the stuff into the Tundra from when I took it out of the FJ. I noticed that I had some stuff that was in multiples that I don't need. The old put it in the truck and forget about it only to add the same thing again a few months later. I'm also going to go from a backpack to an Action Packer and small ammo cans to organize things a bit better.