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I've always greased the tow ball on my cars and place those plastic protection caps on as well. Trouble is the caps get pinched by persons who obviously have a greater need than me and consequently I'd get grease on my trousers on more than one occasion so maybe that's a good case for not greasing the ball. I have a feeling that it is illegal to drive around with the gooseneck/tow ball without something hitched to it, may be an old law? Pretty useful though, I've had a few people run up the back of my car on a few occasions and the damage inflicted on their cars can be pretty nasty as it is virtually a point impact. Not so good is banging your knees and shins on it as most would know. Sorry, a bit off track but yeah.
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