Well. I am hoping you would see it coming. Like.... things start going nuts and you see that a world war is coming..... that's when you load up the truck, grab the gas cans, and head for the hills, drive in as far as you can, remove master fuse from truck's under hood fuse box, and put it somewhere you'll be able to find it if you actually ever can get back to the car and it's still there working when you come to it. Plan on walking as far into nowhere as you can, and carry as much as you reasonably can.
Also have enough extra in the truck that if you set up a base camp, and feel like risking it, you can go back to the truck and get more crap a few days later.
Set up shelter, and start planting some seeds. In the meantime hopefull you have a duffle or extra pack with nothing but dried foods like beans in it to hold you over for a few weeks, or more and try and hunt to ass to the beans or rice to supplement the meal.
Start getting to know your surroundings and find out what you can make work for you.
Start making temporary shelter, and then start working on somewhat hidden permanent shelter (IE dig out a hillside, or start longcutting some lumber) as well as harvesting ungodly amounts of firewood and covering it with one of those nice thin 20x20 tarps you have tied in your bugout pack (you did bring one didn't you?)
Hopefully you remembered some form of firearm, hopefully it has ammo, and hopefully you're not a lousy shot, or else it's time to set some snares.
So many things to do....... hope we survive. Sure would suck to die trying to escape death, wouldn't it?
Hopefully it's more than you and your wife. If there are 2 or 3 guys put 1 on woodcutting duty, and 2 on shelter. Then once shelters are made, get on wood chopping. Once you have an OK supply of wood start working on permanent shelter. Each worker taking a 1 hour break to patrol.
Make sure to add some form of treestand/lookout area in a tree to the construction list.
Get women gardening, taking care of kids, and pitching in where they can help or know what to do as well. At some point you would have shelter and a schedule for wood. Duties would be assigned, basic rules would be setup in your own survival form of government. Start talking about growing food and living food harvesting. Hopefully you brought that canister of salt with you to preserve some of the meat that might otherwise go to waste.
Also, hopefully, you can set up next to some form of fresh water source or withing a mile of one, and if it's snow/ice runoff it can offer some form of refrigeration or temporary food preservation if the food is bagged (you did bring a few plastic trash can liners, right?)
Basically building you own little colony and hopefully more useful people would show up, but not so many that everyone was fighting over shelter, food, and hopefully if there are kids around one of them isn't a pedophile.
Oh man..... there's no way to even start rationalizing this stuff, becasue there is nothing rational about it.
There can be some basic prep and knowledge, but the rest will be by the seat of our pants.