High lift jack on the roof rack
3 fire extinguishers
6 ton bottle jack
15# Co2 tank
1 tool bag with gerenal purpose tools/sockets/wrenchs
Frisby - (games, collects/holds water, makeshift bowl, etc)
Nuvi GPS navigation
LED maglite on key ring
Spyderco in pocket
Swiss army knife in pocket
Hankerchief in pocket
Go bag -
Lots of stuff - but primary item is a water purifier with 2 ceramic filters.
eta: a few years back SOF (Soldier of Fortune) had an atricle on NBC (Nuclear, Biological, Chemical) preparedness. The bottom line is that if one prepares for natural disasters like Tornados, Snow storms, Floods, Draught, Riots, etc, then one is pretty much prepared for anything. It doesn't take a lot of extra gear - some general purpose camping gear is a basic beginning. The real trick is to understand the multipurpose uses of various common items (like a hankerchief can be a filter strainer, a sunhat, a tournequet bandage, even a snot rag)-(an AA mini-maglite is the same dimensions as a Kuboton and legal on airplanes)-(a camera monopod can serve as a hiking stick, cane, club, tent support, etc and is legal on airplanes)-(the same gortex rainsuit that serves you on the golf course, also works on the motorcycle or fishing on the boat and even works as cloathing while backpacking). note: Honey never spoils.
I think ultra light backpackers have pretty much nailed the minimalist approach to survival. They are a great study in making do with not very much. Well worth the research time.