I have a 93 toyota extra cab and i use to have 2 10" rockfords in single bandpass boxes right now i have two 10" eclipses in single boxes I like this way because there is still enough space for someone to cram in the middle seat in the back, Oh ya i just took the seats off on both sides in the back and Placed it in the middle.
I have 2 12" MTX bluethunder's and a volfenhag 1000 watt amp. It Makes people 3 cars away look.
I have an 89 extra cab and I put my amp in the compartment under the left rear seat. The Subs are in truck boxes and give enough room to put 2 small or 1 big person between.