tahoe or suburban? mine is the xl and I have the power liftgate, seems to be all kinds of room in there I have a bunch of stuff and could fit more if I shoved it down in the wheel well area, lol it's like Felix's magic bag.I need to do some more fiddling with the space in there. I think if i fold the cables better I may be able to fit the emergency water packs, jet boil, and ramen in there too.
Edit: my 07 is an LTZ with Bose speakers and the factory navigation