Running A bazooka 6 rs series which replaced the jack under the 40 rear seat with a remote going up to the front for easy toggling. Here are some picks gives pretty good bass not enough to **** off the neighbors but gives enough thump in the cab.
Here are some pics


The remote is under the lighter

 

I have a 6"powered 100 watt tube behind the seat of my regular cab. I will never get a ticket becuase of it, but it does compliment my add-on audiophile system nicely.