A used but good condition Bulldog Security SA9 trailer hitch lock. About as secure as they get. Over 100.00 new, little used. Only one key, but it is numbered and should be easily available if another is required.

Fits Bradley type hitches. If you are not sure, google Bradley trailer hitch and see if yours is the correct type.

40.00 plus shipping at cost, or collect South Oxfordshire or Gosport.