After working through the above, in a real world situation I would address any impending violation of the Rule of Threes in priority order. Indeed it very pressing, I would survive first and work through my plan second every time!

For some time now I have also broken equipping for survival into categories. For now, I look at the categories of First Aid, Shelter, Fire, Water, Food, Navigation, Light, Signaling, Self-protection, Hygiene, and Morale. Time permitting, I would think about scavenging whatever the car might offer in each of these categories. If resources permitted I would actually write this stuff down, too, to reduce the load on memory and prepare for its inevitable holes [and, for me, restore some sense of control and normalcy].

As with shopping for gear, I would also like to consider scavenging things that are light weight, durable, and multi-tasking. But I would also look for handy consumable or one-time use stuff, such as burnables or strap metal that can be wrapped around a nut ot bolt as a one-time wrench.

I also would try to look at the scavenged stuff as raw materials for primitve crafting. Examples would be use of glass to form cutting tools, fabrics to turn into cordage, etcetera. This is where having learned some primitive skills comes in handy.