For a while I ran 2 10" Memphis ported subs with 1500w as my center console. I planned on building a custom box for that but gave up on that idea for now.
I then came across these, which is 2 JVC 10"s in a sealed box (I prefer ported and tuned) but they were cheap. The box is meant to go under the seat of a Crew Cab.
You must be registered for see images attach
You must be registered for see images attach
Because the subs are faced to the rear cab wall, try running those subs behind your seat at 180 degree phase. They will probably hit harder.
If your amp has a phase switch, set it to 180 degree. If it doesn't, reverse the speaker wires at the sub-woofer box (pos to neg, neg to pos).
What this does is move the sub-woofer's cone towards you during a bass note. I should create a harder hit.
It usually works, but if you think it lost bass, wire it back in phase.
For those of you with sub-woofers facing the rear of a car/sedan trunk, but the enclosure is up against the back seat, don't follow this advice. Keep them in phase.
You're essentially creating a large band-pass box out of your trunk. You'll get bigger, badder bass.