I put 6x9's on 1.5" standoffs on my doors in the bottom front corners. Some hacking was required. I just cut enough to clear the magnets. Be careful to not cut the anchor for the window lift mechanism. Had I a larger budget, I'd put some mid-range and tweeter speakers on the doors that wouldn't require cutting and then build bass cabinets into the sides either behind the rear seat or perhaps in front. It would depend upon how many people were in the truck on average. Probably 8's or 10's. Then if I was still on a limited budget, I'd do passive cross overs. otherwise, active and lots of amps. I have 6x9's in back as well, but mounted in that crap cardboard. When I have some time, I'll build wood enclosures behind the side panels. Having built a lot of different speaker enclosures (I'm an EE), I've found that that getting the enclosure right is the best bang for the buck. You can wire passive cross overs yourself, it's pretty easy. Even hard-wired actives aren't that hard. Just gotta follow directions. While I haven't looked, there's probably lots of stuff on the net on how to design and build cross overs.