I know a few with 90s and 2000s Chevy pickups, suburabns and Tahoe's They are fine, they come in 4 wheel drive but if you truly want a vehicle designed for off road there are many many many many better choices, infact not sure if I could think of a worse choice. I am not saying there is anything wrong with them as a truck or people move, just they suck off road. If the wind blows from the wrong direction there 4WD stops working. They have absolutely no articulation. And even with the best tires GM has found a way to make a vehicle not get traction. Unless you find an older K5 blazer.
Initially you said you had an 4-8K range. Personally I would consider a 3rd gen 4Runner or a think about a Jeep Cherokee XJ. But you didn't have Jeep on your list. You should have a decent amount left from you 4-8K budget to really goes though either one of these vehicles and get them running really nice. If they are too short for sleeping think about a tent.
Blah blah blah. The 99+ electronic 4wd system is pretty simple and reliable. Three things go wrong with it:
-The transfer case motor thing is the most expensive and time consuming to replace. You can buy the whole assembly for ~$250 and swap it, or put new guts and reseal what's in there for under $100. Takes an hour to do.
-The 4wd switch also goes bad. 5 minutes and $20 for the part.
-Last, the ground for that switch and most of the dash is under the frame rail right at the driver's door. DUMB. It gets all corroded and janky and will throw the service 4wd light as well as cause the 4wd switch to eventually fail and make your dash lights flicker-y. Easy and almost free to fix.
-The electronic front axle disconnect is pretty reliable over the older vacuum one, and I don't see problems with that much or at all.
The G80 locker works well enough, and the 4L60E has a decently low first gear. It always impresses me off road, and does very well for a low, long, full-size truck. I have 285/70-17s and ~2" of lift. With one size taller tire and another inch of lift it would be perfect, but I don't wheel it enough to warrant the taller size and the gears in my truck are 3.42s. You can find them with factory 4.10s easily, but my truck must have been special ordered bc it has the Z71 pack and tow pack, but highway gears. Still more than enough power though.
Can't flex or get traction? Quite the opposite, my dude. And remember, you have 295 rev-happy horses on tap when all else fails. Can't say that with much else mentioned in this thread. I've been stuck in my Discovery in spots where I didn't have enough power to motor out. Theres something about being able to lay into the skinny pedal until the tires find something to grab.
You need to remember it isn't a JK on 37s, and have realistic expectations.
I've had two XJs, and friends with 3rd gen T4Rs, and would never want to be two people and two animals on a long trip in either of those. They are pretty small inside. I know this is the Toyota forum (I'm actually thinking about getting into a LC100 next, never been a pickup guy but I needed a truck and this one fit the bill when I got it) but I'm just trying to show the bang-for-your-buck in this body style Chevy.