What is a good rule to follow when stopping a truck on an uphill grade?

Using the parking brake to hold the vehicle until the clutch engages is a sound rule when stopping a truck on an uphill grade. This practice is essential for maintaining control and preventing the truck from rolling backward as it can be challenging to quickly regain control on a slope. The parking brake serves as a reliable safety measure to secure the vehicle in position.

When a truck is stopped on an incline, the force of gravity will naturally cause it to roll backward if not properly secured. Engaging the parking brake provides an additional layer of security, allowing the driver to focus on safely shifting into gear without the immediate worry of losing control.

This approach also prepares the driver for a smooth transition back into motion, as engaging the clutch while the parking brake is applied can help to prevent stalling and rolling, making it easier to regain forward momentum once the driver releases the brake.

The other choices do not provide the necessary stability and safety measures required on a grade, highlighting the importance of using the parking brake effectively when stopped on an uphill slope.