Vehicle prep from waypoint
Research the 'known faults' for your vehicle, and address them after comparing various experts' recommendations.
A well maintained and recently serviced 4X4, with low-range gearing. The service must include all filters (air, oil & fuel) and all oils (engine, gearbox, transfer case, differentials).
Professional underbody inspection especially transmission, driveshafts, axles, wheels, brakes, steering, suspension, exhaust.
Professional engine bay inspection especially water pump, radiator, alternator, starter motor, manifold, belts, hoses, battery mounts.
Quality mud-terrain or all-terrain tyres in good condition, definitely not retreads, deflators for airing down and a portable compressor for airing up.
Low profile tyres are unsuitable. Fit smaller rims with taller tyres.
Fit underbody protection only if you have to, it adds a lot of weight which puts increased strain on the transmission and drive-train.
It's a good idea to carry a fire extinguisher, make sure it's secured tightly.
Spare parts and fluids, as appropriate for your particular make of vehicle.
Plus the following: hoses, jubilee clips, baling wire, large cable-ties, fuses, bulbs, belts, duct tape, WD40, nuts & bolts, tyre valves etc.
Breathalysers, warning triangles, hi-viz jackets and headlight deflectors are required in most of Europe. You must also have a casualty grade first aid kit.
Carry a reasonable selection of your most commonly used tools.
Your vehicle must be equipped with a CB radio, in proper working order.
A 20L jerry can of diesel, mounted on the outside of the vehicle.
Recovery gear including strops and shackles, and a good shovel.
Inspect your engine bay, undercarriage and the condition of your tyre sidewalls, at the end of each day's driving.
It is good practice to blow out your air filter after a day of dusty driving, and obviously check oil and water levels at the same time.
Inspect your undercarriage and the ground under the vehicle every morning, to check for any oil, water or fluids leaking.
You do not need to modify your vehicle, but uprated suspension (for strength not lift) is absolutely the single best investment you can make to your vehicle.
If you drive an auto, you MUST change the ATF, preferably replacing it with Castrol Transynd. Consider installing an additional in-line oil (ATF) cooler.
Do not over-prepare your vehicle. Weight is a killer; not just fuel, but increased strain on the whole driveline and transmission. Do not tamper with factory fitted systems.