Lake tankers were small (up to 5,000 ton) specially designed shallow-draft tanker ships that carried the crude oil, pumped from beneath Lake Maracaibo in Venezuela, to the three off-shore refineries located on the Dutch islands of Aruba and Curaçao.

The crude obtained from Lake Maracaibo was processed at refineries located at Aruba and Curaçao, Netherlands West Indies.

Aruba had two refineries, Lago Oil and Transport Company, owned by Standard Oil of New Jersey and Eagle Petroleum Company, a subsidiary of Royal Dutch Shell.

The Lake Tanker was a small vessel in comparison with the larger ocean-going oil tankers; it had a trunk deck hull with a very shallow draft and a flat bottom, which allowed the ship to maneuver over the ever shifting sand bars that blocked the channel going into Lake Maracaibo.

The last Lake Tanker, SS Trujillo, was retired from service in December 1954 and sailed to Jacksonville, Florida, where it joined another 12 decommissioned Lake tankers that had been active as of January 1954.