I always keep this with me, no matter where I go..
Within arms reach (back seats): Large full tang knife, water, food, leatherman, folding knife, flashlight, window breaker, gloves and hat (alberta), radios, pen flare gun and bear banger, cell phone chargers, spare batts, multiple batteries, am/fm hand crank radio, string, small aid kit, blankets
In the boot: Full first aid kit, jumpers, Large hatchet, folding saw, bottle jack, hi lift jack, torque wrench, impact gun (batt), tire patch kit/plug, air comp, spare tire, jerry can, more water, tarps, med ratchet set, hammer, pry bar (most used, heh..), lots of dif. ratchet straps, bungie cords, zip ties, blankets, (dry bag - misc. survival crap - grab and go style), recovery kit bag (tow straps, d-rings, hooks, gloves, plyers, tape), tp, clothe, plywood bases (10" square), and a cheap 12-gauge pump with various shells for squirrel to grizz (legally locked and stored, I only promote hunting within season):ranger:
Now I list these, I should also have: water purifier, canteen... oops
2012 SR5 Upgrade Pkg. - BFGs - Gobi Stealth - Mats - stinky dog