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Message: <blockquote data-quote="olroadbeech" data-source="post: 3478517" data-attributes="member: 52145">That's why after you do the tug test you get out and check to make sure the handle is all the way in and then go under trailer and see that the jaws are all the way locked. not all drivers do this and they are just asking for trouble.a trailer can act and appear locked , even can driven miles with no problem , but it may not be totally locked. if you see any shiny metal on the jaws around the kingpin , then it is not properly locked. In that case I would start over and unlock the handle, pull out about a foot or so and then rehook. That works most of the time.If not it could be a couple reasons. bad angle, slightly high pin ( trailer too high off ground ) and in rare cases the locking mechanism is filled with dirt and/or needs to be cleaned out and readjusted or repaired or replaced.</blockquote>