Well I was not happy with the supercrew box so I decided to build my own.
Pic is before I siliconed inside & out and wrapped it with matching medium graphite carpet. I also picked up a roll of poly fill at walmart (not the stuffing poly fill) and double layered the inside walls minus the front. All made with 3/4 MDF. I gorilla super glued and pressed in t-nuts for mounting the subs. I will put pics up of it finished in my truck once I finish some wire routing/management.
I also finished up sound deadening both doors with KnuKonceptz Kolossus 100mil CLD. I will eventually deaden the roof and back wall as well. I plan here soon to use the left over CLD to place around/inside the rear speaker housing. I traded my JL 500/1 V2 amp for a Sundown Audio SAZ-1000D amp; man what a difference!
It is not perfect but it's the first box I have ever built, but it sounds amazing. The average person wouldn't believe I have two 12" shallows in here.