Yeah, I've seen numerous 3rd gen T4R's listed f/s with over 300k miles, even one with over 400k (miles!) on it. Dude still wanted like 5k for it, haha.The 3.4 is a tough motor, lacking in the overall power department it makes up for in reliability. There are folks well over 500k on theirs and still going strong. I have 310k and im getting a 22.4 average mpg. and PS the timing belt ting every 90k is a best practice but not exactly necessary.
But it seems you got your mind made up and afterall its what YOU want. Find a good one and dont be afraid to get dirty checking them out. One other thing to consider is also aftermarket support. I dont think youll have a problem with a Tahoe. CBP around here have a lot of them set up for high speed desert.
That's pretty impressive mpg you get with yours, btw. I think these things were originally rated at like 16/19.
I see you're in AZ. Maybe I'll have to head out your way to find a good 4Runner! The problem with the ones here is that the frames all rot out. I was psyched to go look at one this past sat, it was a green '99 LTD with 176k, locking rear diff, and an impeccable Carfax for 4500. That's pretty much EXACTLY what I wanted. I was super stoked on it, had cash in hand, and before I was about to make the 3.5hr trip to check it out, calmed down enough to do some research on it based on info I got from the Carfax. Turns out it's last service at the Toyota dealer it had been to all it's life was to diagnose a driveline clunk, where it was found that it had rotted rear suspension parts as well as a rotted frame. Leaky steering rack too. This thing was well taken care of, and clean. But that's what New England winters will do to a vehicle.
I've never heard of this issue on a Tahoe. I'm sure it's happened, but if so, it's not a super common issue like it is on Toyotas. Luckily with the domestic vehicles, seems like the frames tend to hold up but the rockers, bumpers, etc are more susceptible to rust, and at least those are easily visible.