is it possible to fit a pair of subs ported under the back seats? either a pair of rockford p2 12's, or p3 10's? i know its doable sealed, but i'm not sure about ported. i don't have the truck here, or obviously i could measure it. my friend is deployed right now and just sent me some money to put together a system for him while he's gone, so any help or suggestions is appreciated.