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A portable tank mounted on a truck or trailer must be at least how many gallons to require you to have a tanker endorsement on your commercial drivers license?

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Final answer:

A portable tank mounted on a truck or trailer requires a tanker endorsement on a commercial driver's license if it holds more than 119 gallons.

Step-by-step explanation:

A portable tank mounted on a truck or trailer requires a tanker endorsement on a commercial driver's license if it holds more than 119 gallons.
The requirement for a tanker endorsement is based on the size of the tank, not the weight of the tank or the vehicle it is mounted on.
Therefore, any portable tank with a capacity of 120 gallons or more would require a tanker endorsement on a commercial driver's license.

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