When backing under the trailer during coupling, what speed should you use?
a.Fast to create momentum
b.Moderate speed to save time
c.Back under slowly to avoid hitting the kingpin too hard and damaging equipment
d.Speed does not matter during coupling
Explanation
You should always back under the trailer slowly during coupling. Hitting the trailer too hard can damage the kingpin, the fifth wheel, or the trailer itself. Slow and controlled movement ensures a safe and proper coupling.