By 2040, maybe even 2030, there won't be any human drivers, loaders, sorters. Robotics and AI are advancing far faster than most people realize. There are so many ways around the need for drivers when all the 'personnel' at delivery locations are robotic as well. For any situation you could hypothesize that might require a human, a workaround with AI could be figured. If nothing else, in particular situations, a 'remote' operator could operate the robot and communicate via a screen to solve any problem.
Robots will be so cheap that hiring people to do anything 'manual' would be a violation of a corporations duty to the stockholders to maximize ROI, unless laws are changed to protect jobs.