This is a 2001 GMC Yukon Denali that our shop, Pro Audio and Truckmasters in Corpus Christi, TX. completed in Aug. 2002.
Enjoy...and sorry the pics are kinda dark.

Here's the Denali in question...fairly stock looking when we got it. He later put some 23" Helo wheels and Nitto tires...sorry no pic.

This is a shot with a little too much sun on the subject. The customer was very specific about wanting to keep the third row seat. Of course he wanted lots of bass though...they can never make it easy can they?
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A little closer shot of the hatch area. The customer wanted a highlighted install that was loud and clear (don't they all?). I think we pretty much gave it to him.

That's two JL audio 12 W7's in a sealed box with plexi windows in order to show off their enormous and beautiful motor structures. The area behind the third seat is pretty small but we managed to get some BIG sound out of that space.

Another pic of the rear. Notice the motorized amp rack in the full out position. An eight inch linear actuator handles the movement and is activated by the factory door lock switch on the rear pillar in the hatch area. Using a latching relay and a limit switch on the in stroke, one touch of the lock switch either opens or closes the rack.
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One more shot of the rear. Notice the DENALI factory logo on the amp rack face. This sits on some gray wood burl that matches the wood accents inside the vehicle. We just thought it was kinda cool. The baffles of the subs are accented in the same gray burl.