I have 2 JL 12W6v2s and I want to build a box and bolt it to the deck in the trunk. Is it strong enough to hold it? The box will of course be made of 3/4 MDF and have some 1/2 plexi. I want the subs to be mounted upside down shooting into the floor of the truck but I don't know if the deck is strong enough to support it. Thanks 