What is the recommended method to check if a trailer is properly connected to a towing vehicle?

Performing a gentle tug on the trailer is an effective method to check if it is properly connected to the towing vehicle. This action allows the driver to feel for any movement that would indicate an improper connection. If the trailer is securely attached to the hitch, it should not move or shift under the pressure of the tug. This method is straightforward and can quickly confirm that the coupling mechanism is properly engaged, ensuring safety while driving.

Other methods, while useful in their own contexts, do not directly assess the security of the connection in the same way. For instance, visually inspecting the coupler location can help determine if the coupler appears to be properly seated, but it does not confirm the attachment's security. Testing the brake lights checks for electrical connections and functionality but does not indicate whether the trailer is securely connected. Estimating the weight shift during acceleration may provide insight into how the trailer behaves while moving, but it doesn't offer a direct assessment of the connection's integrity.