if you are trying to avoid fabrication to your truck, yet still have a system that bumps, you'll need to reevaluate your choice of subs and setup. Yes, SA12s will pound your life away, if properly placed in a nice enclosure. with what you are wanting, you should go with 10s and an amp with cleaner power to sound good and keep your factory look inside the cab. you may be able to get away with a single 12 under the seat, with a nice port, and it will slam.