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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).
How many barrels of oil does a tanker truck hold? A gasoline tanker truck holds 9,000 gallons of gasoline. Since a  barrel of oil is 44 gallons, one can assume that an oil tanker  truck can haul about 200 barrels of crude.