Has anyone put a woofer box behind the seat of a pickup? I have a 73 K20 that I plan to put in a CD player, 6x9's in the doors and an amp under the seat. I have some 12's from when I had a 81 Blazer. Can a box be put behind the seat? Im 6'1" o I need the seat back as possible. Im no longer a kid so I cant o the steering wheel in the chet thang no more. Any idea's???