a liter of Urine in the fuel tank would disable them, so make sure plenty of restrooms are available.

A $5 magnet and $30 of electrical equipment could cause the electrical systems to permanently burn out as the induced voltage might go too high. so you may wish to ensure electrical diagnostic equipment is properly grounded and not connected to electrical mains.

Also be careful with unidirectional speakers, they can shatter windows and cause extreme disorientation in the drivers even if the children in the vehicle can’t hear it…

Well 16 year old laptops are still snappy Linux systems, so continue to use them or give them to other people for free who might have a use for them.