Truckers: automated via AI and robotics.
Farming: same thing with vertical hydroponic farms.
Retail Sales: Is that still a thing? If so... why? We'll buy more things via augmented reality and virtual reality, probably delivered right to our doorstep via drones. Turn those waste-of-space malls and retail centers into parks for kids or solar panel energy stations or something better than alters to consumerism.
"...makes the economy work"
Much of the economy, I think, is completely wasteful. People go to work for 8 hours a day but don't actually do much productive work. This move to actual stores of value that work will accelerate the adoption of AI and robotics because the people will have enough money to pay for the advancements in science and technology research to make it happen.