ok, on my suburban i have a dip in the floor for the stock spare in the back driver's side corner, well that doesn't do much good anymore what can i use that hole for? would it be possible to make a custom subwoofer box for that hole? would it be practicle? i don't want a sub box that takes up a lot of space so i was thinking this could work. if not i'll put a couple of subs under the middle seats.