No problem man. Yes place them all the way to the back seats but facing towards the trunk lid. Those 12" Solo X's are going to hit hard as hell, especially when you get two of them. Let me know what you decide to do and some pics would be cool too. I am going to get me some 15" ones to put under my back seat of our 2000 Chevy crew cab and then some new speakers. I am not all into that rap bass crap though but for what I get my stuff from them for I might as well take the stuff. I need to just call in and order but the CD player in the truck broke so need a new one. Too bad I have to pay for the Cd player Some Led Zeppellin sounds good though with loud bass on that song "No Quarter".
Kicker also sells a badass custom made fiberglass boxes too, or they used too, not sure if they do anymore, so if you have the money then check them out as well, they are nice.