Andrew,
Thank you for your inquiry, recently we have installed a stereo system in a Peterbilt day cab that consisted of-two 10″ kicker sub woofers, two pair of 6.5 components, all powered by a single 4 channel Rockford Fosgate P400.4 amplifier. This system was loud and the bass hit hard, this would be a good choice for you to use in your day cab.
Thank you,
Cesar Alvarez
Audio Specialist
Triple R Diesel / Texas Chrome Shop