When should the engine be turned off while putting a boat onto a trailer?

Turning the engine off before moving the vessel onto the trailer is an important safety practice. This ensures that there is no risk of the boat accidentally being thrust forward or shifting while being loaded onto the trailer. A running engine can create unnecessary noise and turbulence, which could affect control of the boat during the loading process.

Additionally, turning off the engine reduces exhaust fumes and the chance of mechanical failure during the trailer loading process. It allows for a safer environment for both the individuals loading the vessel and anyone nearby. This practice aligns with proper boating etiquette and contributes to the overall safety of the boating experience.

The other options suggest turning off the engine at different stages of the trailer-loading process, which could lead to safety hazards. For instance, leaving the engine running while attempting to maneuver the boat onto the trailer can result in an unstable loading situation.