As with all things Lego, there was a lot of tweaking done to the original police Xterra. Eventually I wound up with this:
Added radiator and coilover shock details
Armed to the gills (and comparison to the old wheels). All these weapons fit inside (except the new Officer Bricken's tactical vest and belt). Shotgun now mounted in traditional location.
I even managed to incorporate an articulating rear axle.
These images represent a near-2.0 Xterra - one final change was made, moving the roof rack one stud in and adding slopes to fill in the edge, which can be seen in my 2.0 Xterra. Further edits include removal of the chair piece for the driver's seat, so Officer Bricken can wear his tactical vest inside the vehicle.
Upgraded the roof fairing to match my newest Xterra, changed the roof up a little, and swapped in the rims from my Calliope's Revenge Xterra for a much more aggressive look.