Think about what you will need when you blow or just flatten a tire because someday you will:
Bottle jack, Jack stand, torque wrench, tire repair kit, 100 PSI compressor, wheel chocks etc..
Add to the good lists provided above - electrical connections, butt and ring, heat shrink, some extra wire, preferably duplex and of course a crimper. Harbor Freight is a great place to pick up inexpensive (yes, they are cheap), tools. Better to have a cheap one in the storage bay than a top of the line back home in the garage. Don't forget at least two A - B - C rated fire extinguishers (you do have experience using them right?) along with a serious first aid kit, supporting textbook and the ability to use them in an emergency. :C