One nitpick, the driver will more likely simply drop the trailer off, and pick up a new trailer to go back back home with. The self driving truck will be valua

One nitpick, the driver will more likely simply drop the trailer off, and pick up a new trailer to go back back home with. The self driving truck will be valuable enough that you wouldn't want to waste any costly mileage by having it being actually driven. Another likely scenario, you'll want to design big drop off hubs that are optimized for self driving trucks to successfully park and drop off/pick up trailers.