Should the tow hitch have a cap on it?
It won't prevent rust. Hitches don't look good after a while which is why I hate putting one on a nice expensive car like this. On the other hand, no point in an SUV that doesn't provide utility...
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Figure with or without a cover, water and eventually some surface rust will get in there. If you are in a snow area with road sanding, you will also probably fine grit in there over time too. I have found the covers help reduce a fair amount of that.
If you aren't an Audi brand/logo aficionado, you can buy ones in basic black rubber/soft plastic with maybe a common trailer towing brand name (like Reese) molded into the face either at the corner parts store on via Amazon for < $10. I'm sure there are generic plain face ones somewhere too; just haven't found one yet.
Importantly, there is NO branding, logo, decals, etc. Just a clean look. :-)
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