Toyota Carina diesel estate would seem like a good choice, they will easily cross the 250000k mark, I've done it 3 times.
They have great ground clearance, don't get stuck easily for a 2wd and with a little luck you'll get one with aircon.
They are also very easy to fix, just make sure you change the timing belt before you leave!
For a cheap 4wd, Diahatsu Fourtrak is a great bet,cheap to buy, reliable and capable off road too.  
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