HP makes their H470-series of mobile color printers. You will need the optional DC power adapter if you want to run it on vehicle power. Comes with a battery and AC charger I believe.
Nice printer which holds up pretty well according to the reviews.
I have one on order along with a Toughbook which I plan to make an "supported agency loaner" system for my Mobile Communications Unit (www.armymars.net
). One thing that I've learned is that it is easier and more efficient to bring comm system access TO the user via an Ethernet cable or Wifi as opposed to requiring them to come into the vehicle. It also has the benefit of keeping "incident madness" out of the MCU.