The theft part is massive, if you had a truckload full of computer parts travelling down the motorway at 3am when it's dead. What's to stop some gang with tire traps. Bam! vehicle is over and they have 30 mins to loot before an error is realised.
This is possible in the current configuration, too. In fact, it may be easier to compel a human driver to keep quiet than a networked onboard computer relentlessly feeding speed, position, tire pressure and other telemetry to some sort of remote monitoring facility.
