All my ideas have pretty much been hit.
Hi Lift jack, base, winch kit, wood blocks, bumper and wheel lifting kit for the jack.
1/2" breakover bar with sockets to fit common lug nuts and the serpentine belt tensioner, cheater pipe, WD 40
spare serpentine belt
extra fluids (antifreeze, ATF, oil)
fuses
tire plug kit, 12V air compressor
jumper pack big enough to start dead truck
chains for tires and logchain, tow rope
basic tool kit including wrenches to fit battery terminals, battery brush
shovel, axe, saw
Lots of the new vehicles there is only so much you can fix yourself but having the basics is worth it.
I also carry a Smittybilt anchor for using the Hi Lift as a winch. I just picked it up recently and have never used it, hope that continues. I got it for the truck but mainly carry it in the UTV just in case.
I agree about not getting yourself in trouble in the first place and just walking. Also keep an eye on the weather and get the vehicle out if something bad is headed in and its in a bad spot.