I keep a flashlight, portable battery jumper, a small air compressor (for tires), some gloves and a small tool kit in the trunk. Also always have the cell with me. Plus I carry an "emergency" detailing kit as well.
In the garage I have a first aid kit and of couse a "ABC" rated fire extinguisher. Hmmm, a mini fire extinguisher for the trunk sounds like a good idea.
