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Large Tankers. Semi-trailer is the tanker configuration with the largest load-carrying capacity, up to 9,100 gallons (34,447 liters). The other trailer configurations, being somewhat heavier, can carry less and have capacities up to 8,900 gallons (33,690 liters).
Crude-oil and petroleum-product tankers vary in size from small coastal vessels about 60 metres (200 feet) long, carrying from 1,500 to 2,000 deadweight tons (dwt), up to huge vessels that reach lengths of more than 400 metres (1,300 feet), carry as much as 550,000 dwt, and are the largest ships afloat.