Hey man, I wish I had pics to show you...but I'm a dumbass. Okay, I used to have a 2000 Sonoma, but it hasn't changed that much over the years. Heres what I had: 2 Rockford Fosgate DVC 8" subs, amp, cap, all in a custom box behind my seat.

We put the two 8"s in a seperated enclosures in a long wedge shaped box (to specific volume mesurement, not sure what it was now) on the right side, then where the seats split and the armrest folded down we put an amp rack inside the box (seperate of course) with the amp on the back wall and the cap mounted in front of it. The whole amp rack had blue neons around it and was covered on the front with a lexan window in the shape of a Rockford Fosgate logo and tinted in the rear, so you couldn't see in until the neons were on.

It hit hard, but wasn't boomy like a set of 12"'s or anything. I loved it. I also had a set of RF Q series 6.5" components in the doors and a set of RF Q series 4" components in the dash. After adjusting here, melting there, cutting this, replacing that...and working my ass off I had a system in there that my friends bragged about. It wasn't loud, it wasn't boomy, but it was clean as hell and just sounded beautiful to listen to.

Anyway, I miss that system LOL....but all in all, you can put two good sized 8" subs and an amp back there and keep your jack. I did it