You've finished recoupling. How should you make sure that the tractor and trailer are secure? You've finished recoupling. How should you make sure that the tractor and trailer are secure?

• Possible answers:

   
• A. Try to move forward with the trailer parking brake on
• B. Reverse with the trailer parking brake on
• C. Try to move forward with the trailer parking brake off
• D. Reverse with the trailer parking brake off