Interchangeable trailer ball assembly

An interchangeable trailer ball apparatus comprising:

• a. an elongated bumper pin having an internal longitudinal bore and at least one lateral bore which intersects the longitudinal bore;
• b. attachment means for removably affixing the bumper pin to a vehicle bumper;
• c. at least one locking element movably mounted within the lateral bore between retracted and projected positions;
• d. an operable actuating rod movably mounted within the bumper pin longitudinal bore between upper and lower positions so that longitudinal movement of the rod within the longitudinal bore between the upper and lower positions can effect movement of the locking element respectively between the retracted and projected positions;
• e. an opening on the bumper pin and communicating with the internal longitudinal bore so that the actuating rod can be contacted through the opening and moved;
• and
• f. an integral trailer ball having a socket which is open at the lower end of the trailer ball and which is receptive of the bumper pin so that the trailer ball covers the bumper pin during operation.