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Such an alliance could have a "competitive edge," according to industry consultant Drewry.
Los Angeles Mayor Eric Garcetti's office says there are "plenty of trucks and drivers."
The Texas Coalition for Transportation Productivity has thrown its support behind state legislation to increase weight limits for trucks transporting ocean containers.
Trade Promotion Authority, a bill that grants the president authority to conclude trade deals without congressional interference, moved forward in the Senate Thursday morning.
Three of the biggest U.S. retailers have said maintaining in-stock levels was a challenge in first quarter 2015 because of West Coast port disruption.
The Southern California port plans to acquire 3,000 container chassis in two steps.