To combat truck hijackings by terrorists can be fought with the help of the fingerprint scanner on the steering wheel. I think that this device is not very difficult to think. Besides there are already systems that do allow you to do without drivers.
It is impossible to create software which is 100% risk-free from hacking. What if someone hacks this system and forces the software to reject the fingerprints from everyone? Then the entire cargo movement will e blocked.
Possible to crack only the system to which you can connect from outside. If there is no possibility of flashing then I doubt that happens. Many processors cut software. Did you patched the processors? And this is not a bad thing to save.