What precaution should you take when fueling a recreational vehicle (RV) or trailer?

• Turn off all pilot lights to prevent ignition.
  Explanation:

  "Before fueling an RV or trailer, always turn off all pilot lights, as they can act as an ignition source. Failing to do so increases the risk of fire or explosion due to fuel vapors coming into contact with an open flame."
• Keep the engine running while fueling.
• Pilot lights do not pose any risk while fueling.
• No precautions are necessary.