As a road medic I once asked a long haul (Fuel Tanker) driver about the truck having 2 fire extinguishers. I asked- Does anyone REALLY think that those will help put out a fuel fire from this truck?

He replied that he asked the CDL instructors the same question... He said that they said they were really just to 'put out' the brakes if they overheat. He said that the CDL instructors said that NO...no one expects them to be used for a truck fire.