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Rickmers, which manages the ship for Maersk said Iranian navy fired "warning shots" at Marshall Islands-flagged Maersk Tigris.
Port of New York and New Jersey terminals have seen additional containers from "extra loaders."
Los Angeles Mayor Eric Garcetti's office says there are "plenty of trucks and drivers."
Announced on the heels of a port driver labor strike, Eco Flow will use "free-flow" to move containers out of terminals to off-dock yards.
The stevedoring and ocean freight company's new vessel Marjorie C can carry both containers and roll-on/roll-off cargo.
Ocean carrier Maersk Line says it has not yet received court judgment pertaining to the arrest of the containership by Iranian authorities.