The part that holds the fixed ball. It's held by two small bolts onto the main cross member. Looks like a potential weak point. Usually Witters looks solid.
Other than that its ok.
I always give the tow bar a couple of coats of smooth black paint, always find some part off the bar thats not coated properly, and the way this one was packed is poor, metal on metal contact while in the box, had chipped some of the paint off.
I've done this on the last two cars, and not a sign of rust on either bar after 4 years.
Note i was totally happy with the design of the last xtrail bar.