What should you be careful of if you have a recreational vehicle or trailer?

• Turn off any pilot lights as they can be a source of ignition.
  Explanation:

  "If you have a recreational vehicle (RV) or trailer, be sure that any pilot lights are turned off. These could provide a source of ignition."
• Turn off the vehicle.
• You can get it fuelled while the engine is on.
• None of the above.