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After 3 1/2 million miles of driving an 18 wheeler ( twin trailers ) I have had my share of stubborn fifth wheels. What I can tell you is you don't want any play between the king pin and locking jaws. If you do you have less control over the way you pull down the highway. When you park your rig just shift your truck in the opposite direction, take up the slack and shift the other way just enough to release tension. True, you need to lower the landing gear also to help take the pressure off. There will be times this won't even work, depends on how level you are. I've had my share. Just roll with it.
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