Hi. I'm a relatively new RV'er with a less than 1 year old TT. On the way home from Florida, approximately 250 miles into trip it started to rain and when I stopped for gas, i noticed a grinding noise...
Are you talking about the inside of the coupler itself? I just use a bit of lithium grease on the ball before dropping the trailer down on it. As for the rust, you can probably just use a bit of sandpaper on it, then maybe hit it with some spray paint.