Yeah, check the air ride. My entire rear suspension had to be replaced as my compressor went out two weeks after buying it. That is not cheap stuff to replace, either, although there are ways to reduce costs over the dealer. If you need to do this, let me know and I'll point you to cheaper parts.
Everything else on mine, with about 130k miles, works great. I've heard the trannies have a tendency to go out, and everyone says to get the Corvette servo installed as it helps prevent this. It's like a $20 part, but I still haven't done this because I had to lay down so much on the suspension right after dropping everything I had on the truck itself and I can't afford the shop time right now.
That's all I know of. Enjoy one of the finest rides around!