Well this has been a project I've been planning since I bought the truck 3 months ago.
I built this custom box out of 3/4" MDF scraps that a friend had in his garage. I designed it to allow for .77 cubic ft which is exactly what the subwoofer that I'm using recommends.
I'm using a 8" Kicker Solobaric L7 2011 model and a Kicker ZX300.1 amplifier that I got off eBay for $249. The amp also comes with a remote volume control ****.