I doubt that he is worried about a RWC when he mentioned his main concern is liability in an accident.
However unlikely it is, if the trailer hitch does not comply then it could cause you issues in the event of an accident. Insurance companies are always looking for a way out of paying up and if the damage/cost is significant from an accident, they will find something.
As I said, it is unlikely that the integrated trailer hitch would fail (if used within reason), I do have a close friend who has been crippled for life as a result of an accident where a trailer hitch failed on another car and the trailer crashed into the front of her car and crushed her leg.
Maybe ask if you can get one certified if you're concerned about the consequences?
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