Two landcruisers outfitted well will be your best option. (80 series are a good choice) - they can be found all over the world, especially the third world!
They are the only vehicles that locals trust.
Engines are easy to work on, parts are easy to get...
Coming from someone who lives in a third world asia country for years, if you DON'T get a landcruiser for this expedition, you've made a huge mistake.
In my humble opinion of course.
on your expedition.
