Question Once a coupling is completed, there should be: Answers Three inches of space between the upper and lower fifth wheel. No space between the upper and lower fifth wheel. A moderate amount of space between the upper and lower fifth wheel. Explanation When performing a visual check of coupling devices, you should make sure there is no space between the upper and lower fifth wheel. Ensure that the locking jaws are securely closed around the kingpin. This questions appears in the following tests: North Carolina Double