Regular cab truck owners Rockford Fosgate feels your pain. They've designed their Punch Stage 3 shallow enclosures so you don't have to suffer without good bass. And they build these boxes for strength and durability, with a computer-optimized design that uses medium-density fiberboard and thick carpeting.
Slim box, big bass
The P3S-1X12 sealed enclosure measures only 6-3/8" deep at its bottom, so it'll fit in the space behind many regular truck cab seats. It comes preloaded with a single 12" Punch Stage 3 shallow dual voice coil subwoofer that'll handle up to 400 watts RMS. The enclosure's low 1-ohm total impedance means it'll drive your amp to its max just make sure you pair it with a 1-ohm stable amplifier. If you're looking to save space, Rockford Fosgate's super-small Punch PBR300X1 amp is a good match for this enclosure, generating 300 watts RMS at 1 ohm.