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Hmmm, I had the 3rd row seat out of my 2004 to get to the subwoofer in the rear. Unfortunately I don't recall the specifics as to how accessible it would be without being able to fold it up. I'll do some more digging through my files to try to locate the photos I took along the way.
I checked the factory service manual but unfortunately it doesn't mention how to access the 3rd seat backrest internals without first removing the backrest from the truck and that requires (according to the instructions) first raising the backrest.