[CarWin]

My point is, the king pin is seperate from the 5th wheel plates that utilize the disk. With the disk you DONT need to grease the 5th wheel plates as that is what the intended use of the plate is for.

The kingpin is another issue...it has DIRECT contact with the jaws of the hitch of your tow vehicle. I CHOOSE to grease the kingpin to help the jaws be lubricated on the hitch, and to stop direct steel to steel contact of the kingpin and jaws. IMHO I don't think it is good to have direct metal to metal contact without some kind of lubrication.