Practice question

Before uncoupling a trailer, the driver should:

Pull the fifth-wheel release immediately
Park on level ground, chock the trailer wheels, fully lower the landing gear, disconnect air and electrical lines, then release the fifth-wheel jaws
Leave the air lines connected
Use the trailer parking brake only

Answer: B — Park on level ground, chock the trailer wheels, fully lower the landing gear, disconnect air and electrical lines, then release the fifth-wheel jaws

The correct answer is shown above. Try the full quiz for additional practice.