What does it mean if the trailer rolls freely after checking?

If the trailer rolls freely after checking, it indicates that no brakes are applied. In a properly functioning setup, when the brakes are engaged, the trailer should remain stationary. The ability of the trailer to roll indicates that the braking system is not activated, which is crucial to ensure safety during operation. This could be due to the driver forgetting to set the brakes or a malfunction in the braking mechanism that prevents the brakes from engaging.

The correct understanding of this scenario is essential for maintaining control of the vehicle while stationary, especially in situations involving parking or loading procedures where the trailer could roll and pose a hazard if not properly secured. Recognizing this condition helps reinforce the importance of always verifying that brakes are set when necessary and attentively observing the trailer's behavior before moving the vehicle.