ssa evil 18 help please

[Cochino]

Im looking for any help i can get here, I have a 2002 F150 supercrew and ive taken out the rear seats so lots of room. Im wanting a ported box with sub up port back and i have one ssa evil 18. I know theres lots of designs out there but no clue what i should do. Right now i have an Orion xtr2500.1D but getting one more so i can strap them. Im looking for the hardest bass i can get so idk 27-32htz tuned if possible. So hopefully someone here who knows alot more then me can help me with box design and also how many batteries i will need. Thanks