In 1968, "Ashtabula" underwent a major reconfiguration, or Jumboization at Todd Shipyards, Los Angeles Division, San Pedro, California. A midsection, built entirely new from the keel up, was inserted and welded between her original bow and stern. This replaced the old midsection and increased the vessel's liquid cargo capacity by over one-third. Her new configuration closely resembled that of a more modern type of ship, the replenishment oiler. She continued her Vietnam service through August 1972, when she made her last line swing off Vietnam. The ship returned to Long Beach on 9 December.