If you’re not a union shop, it’s easy. Divide and conquer. Like most employees, truckers in general are stupid and greedy. They are in one of the easiest to organize jobs, but get brainwashed by the firehose of right wing radio.
First step is to isolate the smart ones, which are the people with hazmat endorsements. Treat them well and praise effusively to build resentment. Then take the routes that are cost effective for robots, and offer premium pay and bonuses to the people, but with goals that can’t be met without cutting corners. Encourage reporting of rule violators.
Your goal is to create a toxic and miserable environment that pays just enough. Make them kill each other for a dwindling number of slots. You keep the people agitated and fighting each other, and they won’t notice their toys getting taken away.