The Model Y towing package does not include a ball mount. You must purchase a ball mount suitable for the type of trailer you are towing. The Model Y hitch receiver supports a ball mount with a length of up to 8.5" (22 cm) and a rise of up to 0.75" (2 cm). Do not use any type of drop ball mount that does not meet these requirements.
To attach a ball mount:
1. Remove the dust cover from the hitch housing by using a small object, such as a flat screwdriver, to pry between the dust cover and hitch housing. Store the dust cover in a secure location.
2. If necessary, remove the cotter pin from the locking bolt and slide the locking bolt out of the hitch assembly.
3. Slide the ball holder into the hitch assembly.
4. Align the hole in the ball holder with the one in the hitch assembly.
5. Slide the locking bolt through the hitch assembly/ball holder.
6. Insert the cotter pin in the hole at the end of the locking bolt.
To remove a ball mount:
1. Remove the cotter pin from the locking bolt and slide the locking bolt out of the ball holder/hitch assembly.
2. Pull the ball holder out of the hitch assembly.
3. Re-install the dust cover for the hitch housing and store the ball mount in a secure location.