I agree with the posts man, outside is rediculous. THere are many ways to build boxes inside of trucks, even under limited space, I have seen it a thousand times. Fiberglass may be a great option here considering you can use it to utilize "stupid" space in your truck, like under your seats, in corners, maybe even a supersized kick panel:/ that was a gross idea but it beats having your nice subs foam crack off from sunlight and direct heat, getting tossed around, and face it. 2 6x9's in a lowprofile box under your seat will give you more satisfation bass wise then even 2 15's sitting outside. Not to mention those **** sticky fingers reaching back there. You would have to pull the box out everytime you parked, literally. And your woman won't be to greatful to put your box in your shopping cart and her carry the grub while you are shopping!