my list is similar and growing. Blain's farm and fleet has everything you need. I have used almost everything in this list atleast once.

two small fire exstiguishers(bigger is always better)
12v air compersor, get the best you can. I tried a 5 gal tank but could not find a service station with a compressor that could fill it, even at the iron skillet.
42" Hi-Lift
four 3/8" 15' tow chains(came in plastic boxes).
4 ton come-a-longs(the more the merrier).

an old wooden ammo crate w/handles(have broken these up for traction as well);
various tow straps. (work great for tree savers)
bungies.
12v dc worklight.
d-rings, carabiners, pulleys, nylon string 200 lbs test, etc.

portable 150pcs tool kit, folding plastic kind, with ratchet set, etc.
something like this got it at walmart for 10.00


two clevis d-rings attached to front tow points(hard to do once you are stuck).
spade shovel.
medium hand-axe.
4 lb sledge hammer.

pullable tool box which has, got it at k-mart for 24.95;
5 quarts 4x4 oil.
1 gallon antifreeze.
power steering fluid.
brake fluid.
differential fluid.
funnels, etc.
extra headlights and bulbs fuzes, etc.
vise-grips, various drivers, duct tape, wd 40, etc.
oil filter, air filter, fuel valve, pvc valve, thermostat, etc.


5 gal gas can.
5 quart oil drain pan, sealable.
4 ft 1x12 green treated board.
tarps 3 of various sizes.

Old popcorn tin(seals against weather);
essentials, TP, suntan lotion, emergency blackets, matches, candles, can/bottle/wine-opener, fishing line, 30lbs test, more duct tape, deck of cards, hunting knife, bandana, extra pair of clean socks(great for drive home), etc.

2 2.5 gallon water jugs from grocery store, one for drinking one for truck.

300watt power inverter, nimh rechargable batteries and charger(you'll never be without batteries) you can also power all your stuff from it.

I'm probably missing some things. I like the containers because they are grab and go, takes less than 10 mins. to fully load the truck. And I remember where everything is. What I do is go to clearance sales etc and just pick things up for cheap now then add them to the load. there is always a sale somewhere.