Would like design help for a basic slotted box for 2 FI 18's

[aemeth 10+ year member]

Vehicle : 2005 Dodge Durango

Location in the vehicle: Rear cargo area

Space available (Length x Width x Height): 30" X 47.5" X 22"

Subwoofer make and model: FI Team 4 18 https://ficaraudio.com/product/team4-series-team18/

Subwoofer Size: 18

Number of Subwoofers: 2

Type of Port (Kerfed, Slot, Aero, etc.): Slot

What type of music do you like?: Mainly rock, some rap. I like to listen to slowed music also like decaf's 

Is your goal SPL or Everyday Music?: Everyday music

Tuning Freq (Hz): 32 (open to suggestions)

Volume : should be around 15 cubic feet. Can go a little taller if needed. 

Questions: Where to start lol, i cant make sense of winisp or any of the 5 million online calculators ive found. 

Edit: Forgot to add the power numbers. Will be running 8k watts to them @ 1 ohm. Not sure if that matters. 

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