The CARB has prohibited any truck operating at the ports, the technical name for these kinds of trucks is Drayage Trucks, The CARB has required any of the older Drayage Trucks to meet impossibly high emissions standards. Absolutely eliminating any truck which is over 10 years old, and I'm told essentially eliminating any truck over 3 to 5 years old.

So if you want to work as a Drayage Truck, the trucks which actually drive off those big cargo containers, then you must have a brand new truck, or you're not allowed.