This is what i don't get about Prado's.
Its a Toyota

BUt don't forget to include the $5k+ of accesories fitted.
Coming from the Hilux side which share the D4D engine, I think they are pretty reliable after doing 100k.
Yup, some guys have done injectors but a lot of others have had a good run. I have done a water pump and others have had a good run. I have had to replace the alternator but it gets a hard time. I've got a steering box on the way out but I think that is from a torn boot offroad along the way.
As said elsewhere, failed injector seals get a build up of crud in the sump pickup. When changing oil, I am told you can inspect the screen with a torch.
Unfortunately, with these vehicles $1k does not go far if something goes wrong. If you want to go touring you really need to get a diesel. There are quite a few places where you can only buy diesel. When the engine is working offroad, the petrols will have a much shorter driving range (limited by fuel) as the diesel does not change fuel consumption that much under load..