zztunnell wrote:Plus now Im running a DVD player( not to mention now he wants me to add a PS3). So Ill need the surround speakers.
This "old school" install is turning into a mobile theater.

Nah, I wouldn't do that at all. Wait til the fall and get a PS4.
If it were me, I would put a 32", 37" or 42" TV, whatever fits, facing the rear tailgate so that you open the back door and it's there, and just put a soundbar type of setup below the TV facing back for the sound. A couple sets of 5 1/4's would probably work with a single sub. If you had double doors like a van you could put the speakers in those doors, but you don't. In a perfect world the video system would have it's own amp and source so those speakers only play when the video system is active. Easiest way would be to give it it's own HU. Signal from the DVD/Video Game/whatever into the TV, TV to the HU, HU to the amp/s. Rear HU is turned off, and the associated amps would also be off.
You'd have to sit in folding lawn chairs or what have you to play it, but it'd be cool as hell. The TV's now are slender, and the whole thing shouldn't occupy more than 8 inches or so of depth from the back door at the most depending on how you mounted it. A couple things to think about would be bracing it well, which shouldn't be a problem since they come with wall mounting brackets on the back, and ventilation out the top, because they kick out some heat.
I couldn't imagine trying to play a video game on any kind of screen that would fit anywhere else in the vehicle tbh.
That's what I'd do.

Being loud without good sound quality is pointless, but having good sound quality without being loud is also pointless.