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Rickmers, which manages the ship for Maersk said Iranian navy fired "warning shots" at Marshall Islands-flagged Maersk Tigris.
A strike could come as soon as Monday, according to a statement from Teamster affiliate Justice for Port Truck Drivers.
Southern California container terminals clear backlog in wake of tentative ILWU contract.
Such an alliance could have a "competitive edge," according to industry consultant Drewry.
The truckload freight and logistics provider had net profits of $21.8 million in first quarter 2015.
The third-party logistics provider had revenues of $1.78 billion in first quarter 2015.