One person can not order the vehicle brand new from Chevy. Police Package/Special Service vehicles are for cities, counties, states, and municipalities only. Only way to get them is used.
When an agency orders the vehicle, they choose the options at the time of order. Chevy does not do some things, so after it leaves the factory, it is sent to an official GM upfitter that finishes where they left off, like pre-running emergency equip wires, all the way up to installing everything down to lightbars, computers, bumbers, decales etc. It all depends on what the agency wants. That way when they get their vehicle, it can be rolled off the truck, and onto the street thay day, and go to work.
When he got the truck, it was new/used, meaning it was probably brand new, but the agency changed its mine, it was damaged in shipment, even very very minor, was fix, but they can not give it to an agency, or it was not ordered right so it was rejected. At that point, it is sold back to the dealer, and counts as a used vehicle, so now it can be sold to the general public. He lucked out getting those options.
For the computer question. I just got an awesome MW800 from PJ. I plan on just using on and off via the monitor or CPU button. I have the buttons set to "ask me what to do" if they are pressed so, if I hit it accidently while folding the screen down, it wont go to sleep or anything.
I choose the on-off button because it is less hassel, and less chance of anything going wrong. Say I wreck my truck, I can pull it all out hook up the power and still get my stuff off the computer without having to hook up the ignition wire too trying to turn it on. Yeah it would still be simple, but I like really simple.
Also I plan on using a power timer, so after XX min all power to accessories will be killed anyway. So if I leave it on, it will just be killed after a certain point anyway.
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