As for the grease, that's not recommended. Reese says only a light coating of Vaseline to reduce noise, but that no grease is needed - maybe correct for a dual cam.
LUBRICATION
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Lubricate the ball mount sockets, hitch ball, and spring bar trunnions to prevent unnecessary wear. Trunnions should be lubricated daily when in use with heavy oil or grease. Lubricate upper and lower trunnion pivot pins and the contact area in the ball mount sockets. Excess oil and dirt should be wiped out whenever the trailer is uncoupled.
The above is from the owner's manual for my Reese SC hitch. I follow these directions.
