I'm with you skibum. I would LOVE a Y61 outfitted similar to what these fine people had:
4.2l diesel, locker, tire carrier, OME lift, 37s, RTT, the whole nine. They drove for three years on some of the worlds most out of the way roads and in some seriously rugged country. They drove from Alaska, through Canada, meandered around the US, then through Central America, then explored South America. They then shipped the truck to South Africa, where they spent quite some time exploring, before making their way north, back into Europe, then all the way back to their home country of Norway. In all that time and all that driving, they never once had a major breakdown. If I recall correctly, they went through a set of tires, a wheel hub, some bushings, and a couple other very minor things. It's amazing what kind of abuse those vehicles will take.
If I could get one like that, I'd likely ditch the Frontier for it. Solid axles, reliable and efficient diesel engine, large amounts of interior storage space, and a huge aftermarket. What's not to like?
As for spare parts, I'd imagine some entrepreneurial spirits would find a way to bring a good amount of spares into the country for purchase (think Rovers North)