Very nice, we dont have thoes kind of vehicles here in New Zealand, I have built my SPL truck out of a Mitsubish Pajero(montero) 4X4.
Very similar, 2 Zv3 18s D2's, ONE NS-1, 4 200Ah sealed batterys, Standard wall setup hitting 159.2dB so far. Want to try and do a 4th order like that in it when there is enough time between comps to do it, Any suggestions to box size for the Zv3 18's in a 4th order??