Please ensure you fit a tow ball that is suitable for your intended use.
If towing a caravan with an AL-KO stabiliser hitch you must fit an extended neck tow ball. It is mandatory! carries a fine and points on your license if plod catch you with the wrong type plus it is safety critical!!! - the caravan can / does become detached with very messy consequences. As a caravan service engineer I have seen the results of incorrect tow balls all too often.
Happy towing
Neil