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The Heil, External Ring, DOT 407, Aluminum Crude Oil Tank Trailer has long been the industry leader in durability. With semi-trailers ranging in size from 7700 gallons to 12,000 gallons, Truck Tank and Pull Trailers and Super B Trains for Canadian operations, you are sure to find the right combination for your crude oil transportation needs. The Heil Crude Oil Trailer is a double conical, external ring, 4 baffle design for increased strength and minimum obstruction to limit corrosion opportunities. Let The Jack Olsta Co. customize a Heil Crude Oil Trailer for you today!