Quote:
Originally Posted by CarWin
The disk is used between the upper and lower 5th wheel plates,NOT the kingpin,although it does go over the kingpin to adhere to the upper 5th wheel plate on the coach. The disk only eliminates using grease on the 5th wheel,NOT the kingpin.
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Some people do put grease on their kingpin and that is why I stated that I didn't see any reason why.
I also posted earlier that I have used the disk for 30 years so I do know where it goes.