Not sure truckers are the first to go but they are certainly on the list. I bet cabbies are the first to be chopped. Also on the list: UPS/Fedex, Postal Service, Delivery Services (Pizza for example). The 2nd order changes are also interesting - Parking Garage Attendants, Parking Meter enforcement, Traffic cops, and many more. None of these examples will completely go away but will be greatly reduced. We will still need truck drivers (which will become just passengers) that are trained in delivering hazmat materials to customers. Although these jobs will be lower paid than they currently are.
I don't know... Fedex/UPS might want to keep a human on board. Some of those items are important / fragile / expensive. With a human on board there's someone there to "mind the inventory" and to react if something goes wrong (accident / breakdown / etc.) Instead of the brown-robotic-truck sending out an SOS and waiting for someone to come, a person can be there to make sure none of the boxes "walk way"
Sure... some Fedex/UPS stuff "goes missing off the back of the truck" and I'm sure the drivers are sometimes behind it... but better to have a human there just in case.
I agree with the truckers and HazMat stuff. You want someone around, even if it's just to get help.