I have an early 06 SUT with about 30K on it. Its my daily driver. I offroad often and use it like a work truck. The only things I have worn out are the pitman and idler arms (steering components). But, this is common for these vehicles when offroaded heavily, especially on rocks. And, they replaced a transmission sensor at one of my dealer oil changes, but nothing major or inconvienient has happened with mine.
Other than that, its like any other GM truck or Tahoe. Keep the oil changed, tires rotated, fluids clean, and it will last forever.
You'll love it.
