With these cartrend towing ball couplings, trailers can be prepared for combination with ball head couplings on passenger cars. The installation of the towing ball coupling on the trailer is successful with all square towing tubes that have a width of 60 mm. All necessary mounting holes for the screw fastening to the coupling jaw are already pre-drilled, which speeds up the installation process. The cartrend towing coupling for trailers is compatible with round trailer couplings that have a diameter of 50 mm. These ball head couplings are standard and therefore widely used. Thus, such a trailer is ready for combination with most couplings on vehicles. The connection between the passenger car and the trailer can be quickly released and secured, as there is a large handle for operation. This also provides security through the locking mechanism, ensuring that the coupling and ball head are firmly connected. The cartrend towing coupling for trailers is compatible with passenger car trailer couplings with a maximum support load of 75 kg. Furthermore, it is permitted for use on trailers with an axle load of up to 750 kg. Helpful for coupling a trailer is the sticker near the handle, which indicates the wear limit of the coupling, making it immediately clear whether the connection between the trailer and the coupling is correct and secure.