I had a 1999 Tahoe with over 460,000 kilometres, (280,000 miles) and it was still exceptionally strong. Replaced trans at 156,000 kilometres, couple of alternators, u-joints once, two fuel pumps, four sets of plugs. Ran all synthetic, anal about changes.
I have had quite a number of vehicles but this one was far and away the best vehicle I have ever been involved with. I put it over a 75 metre cliff at Christmas time this year. One of the toughest things I have ever had to do is clean out my stuff and leave such an ideal vehicle in the bone yard.
If you get a good one, they do not come any better.