true, however all they would need is someone in the yard loading trains (who aren't Ford employeees btw, that's a different company) keeping track of things and making note of the rail car numbers.
it's not necessarily an employee. The don't keep the cars locked at the holding yard, so it wouldn't take much for a small group of people at night to sneak in and swap spare tires for the pot ones.
This has been somewhat of an known issue with D3 Explorers for a few years now. Ford has yet to be able to find the source and therefore a solution to the problem
They advise against idling for long periods of time if possible. Obviously cops can't do that so departments are resorting to CO detectors in their equipment. They also advise against using the air recirculating system for long periods so fresh air can come in through the vents.
they do I think, but I know a lot of departments (a least around me) still use the keys like they did with the CV. They must feel more comfortable using keys to get in the trunk where they keep their weapons and supplies rather than rely on a remote that can die over time.