I have the same box but for a single 12. It was a PITA to get in, but it's a solid and good sounding box. I have a Skar EVL 12 D2 on 1500w rms, it's more than I need.
Guy on eBay sells a 2 piece box that fills the whole trunk. Two 10s or 12s. It's something crazy like 4 cubic feet.