We have been focused on just package drivers.
How about Feeder Drivers?
They can take time to pull into every gas station, and truck stop they see on their way to their destination! They can try and encourage all the truckers to consider having UPS handle all the shipping for their employers!
Of course, when they have taken 6 hours for a 4 hour run, will their bosses be amused that they are 2 hours late due to trying to get sales leads?