this is all excellent advice, the only thing I would add is, after my experience with both a GMT800 (Tahoe) and a GMT900 (Escalade) I’ll never own another engine with AFM(active fuel management) that I don’t buy brand new, or buy used willing to have it rebuilt without it. I’ve seen firsthand what that low oil pressure failure does, and the design is flawed. I even bought one that was new enough to incorporate the “fixes” halfway through the 900 line. Still failed spectacularly. I traded it for a Ford.
still have and LOVE my Tahoe. Literally one of the best vehicles I’ve ever owned.
if I were looking to buy right now I’d try to find 2006 GMT800. The difference between the 5.3 and the 6.0 is measurable, but at the weight you’re going to be pulling, you won’t notice much. More important are the secondary coolers, and the rear gears. More gears like on the 6speed give you a deeper 1st, but on the 4speed, you need that beefier rear to pull well. Gas mileage is negligible, even when not towing.
move pulled a 5k camper with my Tahoe, for years. Pulled the same with the Escalade. Now the Ford pulls it (10 gears). Longer wheelbase IS easier, but if you never want anything bigger, I wouldn’t worry about it. If you MAYBE want a bigger trailer one day, then look for a GMT800 HD Suburban. It’ll be worth it in the end.
The 3.08 rear end isn't a good choice for towing. You want the 3.42.
I tow a 6500 lb camper with our 2012 XL Denali but used to tow one about the size of the one you're going to be pulling. A few thoughts:
- The longer wheelbase of the XL/Suburban is a better choice for towing stability.
- AWD/4WD has come in handy a couple of times towing. But we do a lot of boondocking so...
- The factory brake controller is excellent, but installing an aftermarket Tekonsha P3 on a truck that doesn't have it takes literally 30 minutes. All of the wiring is already there.
- More important is to have the aux transmission cooler (sits in front of the A/C condenser for the factory units), but again, those are easy to install if you're a little handy.
- If you can afford one with the 6.0 or 6.2, I would. Much easier to keep up with traffic - especially on the hills, and it will likely have the upgraded cooling components already. Especially if you're planning to tow in the west.
- The 6L80E is a towing beast. The added 2 gears are key. But there's a weak link in the torque converter. The AFM system wears out the lockup clutch over time, and when it fails it sends shrapnel through the transmission and takes it out. I installed a HD torque converter and deleted the AFM in mine to avoid the problem. So, if I were in your shoes with your budget, I'd be looking for a low mileage '07-'09 XL Denali (has the 6.2L and no AFM).
- I also used to have an '02 Suburban, with the 4L60. Never had any problems towing with it, but the previous owner had a rebuilt transmission installed by the dealer about 10K before I bought it.
- If you can find one from California or Arizona, as I did for both of my Denali's, you won't have to deal with SE PA rust issues. It's worth the flight, and chances are a member here can check one out for you. Even Virginia or NC trucks will be in way better shape than anything in PA. I grew up in Pittsburgh - trust me on this