A tank endorsement is: Do you currently have motorcycle insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question A tank endorsement is: Answers Only required if transporting gases. Only required if transporting liquids. Required to transport both liquids and gases. Optional when transporting hazardous materials. Explanation In most cases, you must have a tank endorsement to transport liquids or gases in a tank. This applies to both hazardous and non-hazardous materials.