Tips for sub location

I have 2 - 12" Infinity Kappa subs. I want to find a place for them in my jeep. I plan on making a custom fiberglass box for them. my problem is that I can't figure out the best place to put them. I love to go to the drive in theatre but it is a serious pain to take out the subs everytime I go because I like to put the seats down and make a bed in the cargo area. (Its the only way I can go see a movie because I have a 10 month old daughter). I was thinking I can build the box into the liftgate. I have 43" x 15" to work with. Is that too small to build a proper sealed box for my subs? That would be the perfect place for them and it would look good. Thanks fro any help you pro's out there can give me.

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Imagination and drive are the keys to greatness.
2000' Jeep Grand Cherokee Laredo

why not make them in the wheel well area, you have a space behind there that's almost wasted, and you probably wouldn't loose much width. that's how I'm doing my Bravada

The newer Grand Cherokee's have a recessed spare tire area like most cars. I was thinking about putting them in there, but then I can't lay down in the back of the cherokee because I would be laying on the subs themselves. I could go bandpass to fix that, but the recess isn't deep enough.. Maybe 10", and the subs have a mounting depth of 7".

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Imagination and drive are the keys to greatness.
2000' Jeep Grand Cherokee Laredo

and the wheel well area is really small so I would need to put one on each side... And I don't know if I would get enough air space. I kinda dread cutting the trim also....

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Imagination and drive are the keys to greatness.
2000' Jeep Grand Cherokee Laredo