There use is limited. If they can't get the post office, UPS, Fed Ex on board to absorb the cost to bring the per truck price down, also needs to be attached to a terminal to terminal be with fleet maintenance available. The cost of road calls and time wasted because the truck parked itself on the shoulder at MM 173 (with no emergency triangles deployed, unless the autonomous robot jumps out and sets them up), waiting for Jim Bob mechanic to show up and replace the green corroded wires to the R3 sensor on the second trailer.
You think your package took too long to get to you today, wait till Xmas comes and goes and your still waiting.
Put the trailer on the train. Less trucks on the road, drivers drayage < 100 mi
Trucking is always easy from the outside looking in.