A fire extinguisher in a commercial motor vehicle should be: Do you currently have car 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 fire extinguisher in a commercial motor vehicle should be: Answers Partially filled. Securely mounted. Out of reach. Locked away. Explanation A fire extinguisher in a commercial motor vehicle should be properly filled, securely mounted, and readily accessible. When required, the extinguisher must meet FMCSA regulations.