One part of a buildup that never gets much attention is all the little stuff that you will need to have a safe trip in the back country. Recovery gear, airing down, airing up, and flat tire repair were at the top of my list as I have seen all of these items save the day when 'wheeling with friends.
Here is what I have come up with so far for "Off Roading Essentials": Hi-Lift, Block, shackle and two straps (20" and 30"), receiver shackle, Staun Deflators, A good tire gauge, Tire repair kit (plugs), and an Air pump.
Also, common sense items like duct tape, tools, shovel, trash bags, WATER, MRE's, first aid, clothing/blanket, gloves, CB/2M radio, etc.
Here is my Kit so far:
A Warn block for double line pull:
Staun Tyre Deflators:
El Cheapo Air Pump from 
ebay, 33% duty cycle:
Tire Repair Kit from Northern Tool:
