In general if travelling away from your home continent you should carry an immense amount of spare parts. I carry among other things:
head gasket kit, water pump, fuel lift pump, PS pump, air compressor, starter, alternator, belts, full set of engine sensors, brakes pads and small parts kit, one set of portal box (wheel) bearings, all oil seals, some in duplicate, u-joints, nylon tubing repair parts, air brake rubber hoses and repair parts, lots of filters, high quality oils, electronic foot throttle, electronic trans shifter, throwout bearing for clutch, engine ECU, tyre repair stuff, complete wiring diagram and workshop manual, 1 mounted + 2 unmounted spares, spare O-rings for multipiece wheels, spare CTIS fittings and O-rings if so equipped; spare water pump fr camper, spare water filters, multiple overseas propane filling adapters AN EXCESS OF TOOLS
and last but not least computer for Mercedes Star Diagnosis System
and of course lots of spare wires, splices, etc.
Charlie