When I was looking into this, the problem I found were:
1. Long boot-up time, repeated everytime you're starting the truck.
2. Messed-up files from the sudden power loss when you turn engine off.
3. Rough ride risk on delicate hardisk.
I guess in theory you can put in somekind of relay for power, or a "hibernate" switch? But seemed too much effort.
Seperate components (Lyra video jukebox, video switcher, GPS-PDA) will be easier & cheaper. My 2cents.
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