Want an awesome box plan for 3 12's in a ex-cab silverado

Just want a little more... Dang this is addicting!

Ill try to keep it somewhat short and sweet, this is what i want:

I have 2 12" 4ohm Alpine Type-R's right now and am going to be getting 2 more of them and want to build a box for them with 1 long port over the top of the subs accross the whole box pointing forward (towards the front seats) along with the subs.

Specs

I want the same 32hz tune like i have now because i love the low bass that i am getting now, it could be tuned a little bit higher (not much though) if it makes the box build a little easier, but i don't want to go over 40hz unless you guys would think it would hit harder, i want it to make my eyes blurry as possible, take my breath, and put out some decent #'s on the mic, that isn't to much to ask is it? LOL

Area that i have to work with:

60" wide

i want it to be exactly this wide on the outside diameter of the box

22" tall

i want it to be exactly this tall on the outside diameter of the box

20inches deep

i don't really care how much of this is used up, i could actually go a little more if need be

I want this box planed around the specs and displacement of these subs if that is cool, i will see if i can find the specs for these subs.