A tuff box with two master locks, and a cable lock ancoring it to the truck. Inside is tools, spare parts, more tools, more spare parts.
C02 tank.
Pelican case with camera equipment in it (also locked).
In the X-net i have pillows, blankets, Aero-Bed, and other goodies hanging from it.
Fire extinguisher.
Flashlights.
A glock..
Big bag of recovery gear, D-rings, tow straps, snatch straps, tree truck protectors, pulley, chain, gloves, ratchet straps.
More shit I can't remember right now..
Oh, also my work stuff, lots of crimpers, fiber testing equipment, various cables, loopbacks, the basic Network Admin gear bag.
Laptops.