why? the driver of the manned truck is going to comply just as willingly. No way they are going to put their life on the line (unless they own the cargo). The unmanned truck will cameras and video uploaded, which is stronger evidence than eye witness testimony. Also police response will be faster on unmanned (they can't call the police during the hold up, you can take the persons cell phone). No way you can stop the distress call from unmanned unless you had an EMP or something.

If the truck is manned, it's robbery.

If the truck is unmanned, it's burglary (or theft, since a truck isn't a building).

They typically carry different penalties, and the difference is even more stark if you happen to have anything that could be considered a weapon on you when you do it.

> No way you can stop the distress call from unmanned unless you had an EMP or something.

Wouldn't be so certain. Jammers are illegal, but they aren't that hard to make.