Which of the following is NOT a critical item to check when you stop?

When stopping, it is essential to perform checks that ensure your vehicle's safety and functionality. Windshield wipers, while important for visibility, are not normally assessed during routine stops unless visibility is impaired or conditions have changed substantially. This differentiates them from the other items listed, which are critical to the immediate operational safety of the vehicle.

Lights and reflectors must be checked to ensure they are functioning properly for visibility and safety on the road. Tires, wheels, and rims are crucial for maintaining proper traction and stability while driving. Trailer coupling devices are vital for ensuring that the trailer is securely connected and ready for movement. All these components play a direct role in the vehicle's ability to operate safely under various conditions. Thus, while windshield wipers contribute to safe driving, they are not a critical item to check in every stop compared to the others listed.