Not sure what the details on your truck are, but I found some less common tools required in these spots on my BJ73:
7 and 8mm wrench: Grease Nipples (also an idea to carry some spares)
Wrench / socket to fit your Diff pinion nuts
22mm deep socket: Spring U-Bolts (OME) and shackle pins. (But I also saw other widths in that spot)
Flat snapring pliers, big: Snapring on drive shaft in knuckle (the pointed ones don't work there).
Pointed snapring pliers (set for inner, outer, straight and angled)
Those special wrenches to undo brakelines and injector lines.
Monky wrench for everything missed out
To be considered for a long trip:
Grease gun
Set of drift pins
Tool to undo the track rod ends from the pivot arm.
Small hacksaw
Files (round, half-moon, flat)
Set of very fine screwdrivers (watchmaker). Handy on pins in plugs, O-rings...
Drillbits and accu drill
Easy-Out toolset
Tapping tool. Consider the bigger bolts are fine pitch thread. Carry some respective spare bolts.
Crimp plier, wire, assortment of crimp electric connectors (look what's on your battery terminal, may be unusually wide)
Big volume syringe and some universal clear pvc hose.
Wire and wireclamp tool
Edit added
Multimeter
Cutter knife
Safety goggles, gloves.
Tyre repair set, spare vents
We aren't talking spares here, but some general materials are coming handy:
Isolating tape, self-sealing butyl tape
JD Weld / plastic metal
Wire, ducttape, cable straps.
Assortment of bolts, nuts, washers. Also bolts with fine pitch thread, where applicable.
Assortment of crimp electric connectors, cable, fuses.
Gasket Sealant (e.g Hylomar blue), Silicone
A piece of bicycle tube (makes great gaskets)
4ft fuel hose for your rig and 1/2 ft of some tubing fitting into it.
4ft 5/16 pvc hose
Jumper cable and some welding rots + welding screen for battery welding
Cheeres
Ralf