I have been contemplating sound "proofing" (more like rattle proofing) my trunk for about 4 years now, and just haven't gotten around to it. I've heard of a few methods such as gap filling foam, dynamat, tsunami, to even more strange options such as peel n seal roofing material from Lowe's. I would like to know what methods have been used that yielded the best results. As for what kind of rattling power i have to subdue, i currently have 2 Rockford Fosgate P3 Punch 12" sub woofers in my trunk, but plan on doing a rear seat delete next weekend and mounting both subs in the backboard, facing inward towards the cab. Any help would be greatly appreciated. Ill try to post pics if y'all are interested.