People absolutely rob 18 wheelers, and in creative ways too. There was a story in Sweden some time ago I found particularly crazy – robbers entering the back of a truck, while driving at about 50 mph. They climbed from the hood of a trailing car on to the truck, stole a bunch of stuff, and then climbed back out again. I wouldn’t have believed it if it weren’t for the fact that the affected shipping company (the national post service) rigged trucks with cameras to catch them in action. Mind boggling.
Also, not all valuable cargo are gps tracked smartphones and laptops, and not all situation mean having to stop and threaten a driver. For example: tree logs. They are often loaded onto trailers that are then left standing waiting to be picked up, or left standing part way to their destination because it’s driven by multiple drivers (usually happens when they have a long way to go.) It can take days before anyone even realizes the cargo is gone, because there’s a gap between drop off and pick up.
This kind of stuff is easy to steal, not especially hard to fence, and definitely not something your garden variety meth head does on a whim because of the logistics involved. This is enterprise level crime.
I’ve heard this is especially popular close to unmonitored border crossings (i.e. most EU borders) as it then makes the investigative work harder because jurisdiction.
Sure, gps tracking helps finding the stolen trailer – if it’s even being tracked – but by the time the police get there the goods are long gone and essentially untraceable. Nobody puts trackers in tree logs, and it can take days before anyone realizes it’s even gone because of the gap between drop off and pick up.
Just because it doesn’t make the news doesn’t mean it’s not happening.