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Flexi-Van executive says "misplaced" chassis have aggravated congestion.
Move comes as ILWU, PMA talks enter 10th month.
Workers will try to clear backlog from terminals.
Transpacific carriers cite port congestion and stronger demand as economy improves.
New style port directors are trying to tailor ports to industry supply chain needs.
Senate moves to decouple fight over immigration policy from Homeland Security, but resistance remains in House.