Few thoughts on the whole truck argument. Driven across Aus and across Africa in LR110, now thinking about truck but positive: can create far greater fuel capacity, overland trucks going uk - cape spent less on fuel for a truck carrying 40 people than we did in a LR because they could fill up at the cheap countries and not bother in more expensive places. 2) we had to take dodgy fuel in a remote part of chad because even with 240 litre capacity, we couldn't go all the way from ndjamena 0 Khartoum on a back route without taking it. Had 10 days of hardwork as it gunged up the fuel system. Ended up needing a new fuel pump. A MAN 4x4 truck came though, looked at some dodgy fuel and just turned it down because they had 1100 litres capacity and could do with out. 3) can carry toys as well - kayaks, rafts, inflatable boats, motorbikes, paragliding rigs, dive gear (even compressors), etc.
Downside - rocking up in a LR or Landcruiser already makes you rich in the eyes of the locals. To rock up in an actionmobil US$500,000 8 wheel conversion puts you in another world. Heard of a guy in Libya who was on a practise run before taking his US$300000 creation to India where he hoped to park up and live in a village and get to know the locals - from his fully inclusive vehicle including plumbed in washing machine, etc. To a certain extent, the compromise must be between extended range, capability and comfort v even more of a target for crime and even more removed from the local populace. Given one of the major enjoyments of travel is meeting the locals, this can be a major impediment.