A 2003 Z71 Tahoe owner here.
210,000 miles on the 5.3.
Paid $3k.
I haven't added it up recently, but I think I spent between 2-3 k in upgrades, but $1200 was just in the front bumper and Apex winch. Got a good set of used 305/70R16 (33x12) K02's on Method wheels and put on lots of lights. Indexed torsion keys for 2 or 3 inches on the front and 1.5 inch pucks on the rear coils. Also upgraded tie rods, air intake, new plugs and wires and a few other random parts.
Does decent on mild rock crawling, excellent on gravel and trails, especially with tire pressure in the teens and my front sway bar removed. Gets through snow as long as you aren't sinking in more than the clearance (~12"). Flotation is pretty good for not having extreme tire size, partly because of front/rear weight balance.
It gets 13 ish driving around and that includes a lot of idling time because it's winter and I never put my tires above 30 psi and I sometimes drive it with tires aired down. All driving is at 4,500+ ft here.
Things I would have a hard time giving up:
4 auto- still handles fine on dry roads but kicks in as soon as the rear wheels slip.
Limited slip rear dif- a locker would be the ultimate, but the limited slip sure is helpful sometimes.
I can haul 7 people if I need to, but I can pull the rear seats in <2 min
Sunroof- Sunroofs are UNDERRATED imo!
Sorry for the ramble.
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