The most important steps that I have found helpful with the Hensley are as follows. First to make sure you have your trailer wheels chocked in both directions before attempting to hitch or unhitch. This will keep you from doing any damage to your tongue jack if the shank is hung in the receiver. Second be sure to release all the tension on the spring bars by cranking the jacks all the way down. Third make sure that you have the two draw bars tightened equally so that the hitch head is centered with the trailer.
Before you try anything just crank the jacks up and down with the shank in the hitch and you will see how it changes the vertical angle of the shank. I think this will give you a better understanding of how important it is to release all the tension from the bars before attempting to hitch up or unhitch.
As Barney stated when you unhitch just crank the tongue jack until you see a slight movement in the shank and you will know all the tension is released from the receiver. If you have the cam locks off while jacking the tongue up the shank will come out of the receiver a good bit as the truck will move forward a bit as the tension is released.
