Quote: Nautilus wrote in post #15

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We tow our 530GT with our Karoq, also a retractable hitch, but the instructions for our hitch specifically warn to never apply grease to the tow ball. It's an anti-sway hitch, and the grease would defeat the anti-sway feature.

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Nautilus, I think you'll find that the owners of the retractable tow hitches above recommend greasing them for long term stowage, then degreasing them thoroughly before use.
I have one and if I just use a standard ball cover, it actually fills with water and the ball gets very rusty. I've tried wrapping the ball in a plastic bag secured with rubber bands but the damp still gets in.

Edit: Whoops, didn't see SDA's post on the next page.