From the Journal of Commerce:

Harbor truckers in Los Angeles-Long Beach continue to experience long delays at the ports, but statistics released Wednesday by the Harbor Trucking Association show that the worst delays are not spent waiting in long lines at the terminal gates, but rather inside the terminals.

In other words, the 13 container terminals at the largest U.S. port complex have significantly improved their ability to move trucks into their facilities upon arrival. But once the truck enters a terminal, it takes more than an hour for the terminal operator to deliver a container from the stack, locate a suitable chassis, load the container on to the chassis and process the trucker out the gate.

Truckers are quick to suggest that terminal operators are at fault for the lengthy in-terminal delays, while terminal operators say truckers contribute to the problem. Both say that a shortage of chassis in Southern California is a major contributor.

More at the JOC