It may be different for trucking for a few reasons
1) apparently there is a huge shortage of truckers in the US currently
2) autonomous driving may be great for highway today, but seems to still be a bit away from truly autonomous for city environments. This could lead to a hub & spoke structure which keeps truckers employed, but has them taking over for more local routes.
3) As I understand it, a mechanical weave was always significantly faster than a person, and cheaper to boot. An autonomous truck doesn't get to drive faster (yet), and doesn't burn less fuel. It's efficiency comes only from replacing the person behind the wheel. If the person behind the wheel owns the truck (which is common) it may make their work easier.
4) how many people these days are wanting to become truckers? As truckers retire, and we seem to be requiring more and more shipping (an entirely different issue), could this be a managed transition over 20 years?