While inspecting coupling, you should go under the trailer and: Question While inspecting coupling, you should go under the trailer and: Answers Detach the jaws from around the kingpin. Make sure the locking lever is in the "emergency" position. Look into the back of the fifth wheel. Explanation While inspecting coupling, you should go under the trailer and look into the back of the fifth wheel. Ensure that the fifth wheel jaws are secured around the shank of the kingpin.
