I suspect the issue was a variable amount of detainment while loading or unloading - sometimes the dock was fast - as soon as you bump the dock there is a fork

I suspect the issue was a variable amount of detainment while loading or unloading - sometimes the dock was fast - as soon as you bump the dock there is a fork truck in the trailer moving the shit out, sometimes you'd wait for four hours to be loaded or unloaded. All of that is out of the control of the driver and the company. The current structure of the industry has little market pressure to force the shippers to be better behaved.