I keep a pair of lineman pliers, a pair of side cutters too, two short prybars, a six pound maul, a three pound hammer, metric and standard wrench sets, standard sockets, I've lost count of my screwdrivers; small, medium, and large log chains, right and left handed snips, a hay-hook, duct tape and paper towels (first aid kit), electrical tape, wire splices, six feet of coiled ground wire, box cutter, flashlight, WD-40 and Liquid Wrench, big crescent wrench, channel lock piers, regular pliers, a round nose spade.... and since it just snowed, a small (only 250lbs) cast radiator for traction...

Finally the two most important parts, a smile on my face and a pistol in my belt. :-)