In the early 1950s, McLean decided to attempt use of the containers commercially. By 1952, he was developing plans to carry his company's trucks on ships along the U.S. Atlantic coast, from North Carolina to New York. It soon became apparent that "trailerships", as they were called, would be inefficient because of the large waste in potential cargo space on board the vessel, known as broken stowage. The original concept was modified into loading just the containers, not the chassis, onto the ships, hence the designation container ship or "box" ship. At the time, U.S. regulations would not allow a trucking company to own a shipping line.