Do you need a tanker endorsement for under 26001?

In the United States, a tanker endorsement is required for drivers operating vehicles that transport liquid cargo in tanks, regardless of the vehicle's weight. Therefore, if you are driving a vehicle under 26,001 pounds that is used for transporting liquids in tanks, you will still need a tanker endorsement on your commercial driver's license (CDL). Always check local regulations, as requirements can vary by state.