Hesitate to say this (don't want to jinx it) but I have an '04 fast approaching 400,000kms. So I suppose if it clags it it has earned its keep anyway. Only engine modifications are an intercooler and catch can, apart from that it's stock. Those miles are misleading also as it's spent so much of that time off road working its guts out in low range for not many kms, in all conditions from snow to (more regularly) mid 40's, had the speedo sensor wires ripped off for a while too so it wasn't registering (drove by tacho). To say it hasn't been spared off road would be putting it mildly.
As far as the zd30 goes the only thing I can remember having to replace is a fan belt and a tensioner pulley bearing (probably because of lots of mud and river crossings).Though I'm very fussy with servicing. Have actually had water (snow melt) level with the top of the side mirrors on one crossing, took the risk rather than being stranded (yeah, I know). The two biggest problems I have had with it amount to getting bad fuel (twice). Both times had to remove/drain/clean the tank change filter and blow out all fuel lines.
Have also heard of people with more kms than I have still happily towing their vans around the place. So you can be lucky/unlucky with cars, but I wouldn't worry too much about the bad rep these things got via the patrol. Going from the six to trying to squeeze power out of a four in them was a bad idea (though I think they ended up sorting them out eventually).
The navs are a different thing.