Registration takes less than 1 minute.
Ports believe pool of more than 80,000 interchangeable chassis will help ease West Coast congestion.
Labor Secretary Thomas Perez met both parties accompanied by a mediator from the Federal Mediation and Conciliation Service who has been assisting in the talks since early January.
Draymen say they could be forced out of business by huge demurrage and detention bills.
The port authority saw a 4.9% drop in profits due to higher interest charges and depreciation.
The logistics provider and freight forwarder doubled EBIT and increased profits by more than 600% in 2014.
Containers in stack at Centerm contained trichloroisocyanuric acid, according to the terminal operator.