Im not sure where to start. 2 of the biggest things to keep in mind when picking out components to keep in mid is RMS power and how many Ohm's the speakers are. When an amplifier has a 4 Ohm load it puts out half as much as a 2 Ohm load. Most of today's new amps are only designed to handle a 2 Ohm load, so when buying speakers and subs, keep in mind through series and or parelle wiring you should end up with a 2 Ohm load. (example dual 4 ohm sub can either be wired to 2 Ohm's or 8 Ohm's) Most sub-woofer amp outputs are single channel, therefore my recommendation for sub selection is to choose a dual 2 Ohm sub if u want 2 or just the dual 4 Ohm if u want 1. To save space and money on amps u could get urself a 5 channel theatre amp. It combines ur speaker components and sub-woofer out put. Something like this Alpine amp (MRX-V70) should work good for ur set-up. I would recommend changing ur head unit to a decant after-market one with front, rear, and sub-woofer RCA out puts. Also there is not much room for Dual voice coil subs behind the seats of these trucks. I ended up building a custom fibreglass enclosure for mine. There is way too much to mention for audio system design in a quick post. Im sure u still have lots of questions and i've confessed u with all this info.