Panasonic Arbitrator or L3 Communications have nice systems. We use them all the time in police vehicles. They both come with an SD card (what GB the cards are depends on your needs) and can either be set up with an automatic RF upload when you return to the station or remove the SD card once a month or when it tells you its is nearing "full" status. The good thing..the SD cards are locked behind a door that ONLY an Officer, Chief or someone else designated, will have access to the recordings. You can set it up that it is "trigger or sensor" based, such as when the lights are activated, the camera turns on. It can also be set up with various other sensors that will suit you. It has GPS capabilities so it will recognize when the ambulance hits a pre-set speed, the camera automatically activates. It will also give coordinates of your exact location and roads traveled. I would prefer the L3 since it has a separate monitor that you can view directly in the truck. Since alot of crews use Panasonic Toughbooks, the Arbitrator synchs up with Toughbooks and will show everything on the computer screen. Once you get to the hospital and undock the laptop, the monitor function with turn off but still record and when you re-cradle the laptop, it will upload everything recorded. The Arbitrator will offer a password for those who are given one, to access the video coverage. You can get a rear camera and use it for training as well as evidentiary coverage should something happen while on scene or enroute. The L3 is nice because it has video playback, external speaker and all controls directly on the small 7" monitor. Their cameras are nice and small compared to the huge Arbitrator camera. It will be a horse a piece so to speak and will come down to cost and user preference when decision making comes to head. If I can be of service for you further, let me know. Send me a private message!