I have a 2012 Chevy 2500 Express van that we use to haul our bikes for racing. I have a Kenwood KAC-9105D mono amp (900 watts RMS 1800 watts max) powering two 12 inch Kenwood subs. I am adding another amp (Kenwood KAC-8405 4 Channel 60 watts RMS per channel) to power all the mids and highs...