I suppose company drivers could have the trucker flu or something and stay where they are if they choose to participate but convoy somewhere/anywhere off their route is not going to happen- as you say it would be grand theft. Company drivers are not likely to get involved in any number that would be noticed.
You are absolutely right. Wife of a trucker, here. While he will sympathize with the message, he is not likely to steal his company’s tractor, go to DC and rightfully lose his job over it. Godspeed to any owner / operators who may be participating though.