Subs for trucks are a different game than subs for cars. A truck cab has no trunk, the rear seat is often a bench that folds up, and the usable space is measured in inches of seat clearance, not cubic feet of trunk. The good news is that truck specific subwoofer boxes...
Shallow mount subwoofers exist for one reason: they fit where full depth subs cannot. A standard 12 inch sub needs 6 to 7 inches of mounting depth, plus the box behind it. Shallow mount 12 inch subs drop that to around 3.5 to 4.5 inches, which is the difference...