One 12" in the right box is plenty loud enough. I have a power acoustik mofo122x wired to 1 ohm being pushed by an old hifonics brz 1200.1. At Penn State football tailgates, there is plenty of volume.

I built a box for my friend and hooked up his 2 15" square kickers when I was in highschool. They were only getting around 600watts each but were they loud!

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2000 Ford Ranger XLT Ext. Cab - 4.0L - 4WD - 3" BL - AAL - Maxed T-Bars - 16" Mickey Thompson Classic Locks - 265/75/16 Cooper AT3s - 12" Power Acoustik Sub @ 1200 watts