I have 2 10" Kickers behind seat w/o moving seat forward or anything. I like sound quality over bass...and love how mine sounds. I have Kappa seperates in all doors & Kicker components in Q-form kickpanels.
I ended up using a JL Audio "pancake" woofer set up. It hits okay. Not as good as my burb or my Sierra but its certainly proportionally related to how much air space is available between those rides and my dually.