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Ports believe pool of more than 80,000 interchangeable chassis will help ease West Coast congestion.
Draymen say they could be forced out of business by huge demurrage and detention bills.
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.
The International Association of Classifications Societies said it would continue to study the report and the will finalized the requirements soon.
The fellow NYK Group companies said vessel adjustments reduced CO2 emissions by 23%.
The federal agency alleges shipments did not include relevant documents and were improperly packaged and labeled.