My bug out ride is my work vehicle, same/same, It helps to have a long-bodied cargo van, pre-computer (less to go wrong).
I always carry a shovel and basic mechanic's tools (oil filter and two changes of oil, a gallon of antifreeze, spare fan belts, quart of ATF, brake fluid, etc.) I did too much work in the high desert in NV not to, and shovels are part of the basics (two, because you never know when you could have help). I picked up two square-ended spades at garage sales, and they come along in case I find a snow drift I can't buck. Tire chains, two sets of tighteners, a tow strap and a Hi-lift jack complete the picture, there. (Two spare tires, too). I hadn't thought about it but a sledge and axe, a couple of wedges could come in handy, too.
Three, five days. Maybe up to ten. Disaster planning out of your car, with pockets of gold doubloons and diamonds sewn in your socks is not real or practical. It is NOT supposed to be for EVER. If it is and I am not,...I’m screwed.
Maybe I’ll just go under my desk until the all clear.