CURT Multi-Ball Trailer Hitch Ball Mount, 1-7/8, 2, 2-5/16-Inch Balls, Fits 2-Inch Receiver, 10,000 lbs Model 45650CURT Multi Ball Trailer Hitch Ball Mount, 1 7 8, 2, 2 5 16 Inch Balls, Fits 2 Inch Receiver, 10,000 lbs Model 45650 If you own more than one trailer, you know what a hassle it can be switching back and forth between ball mounts and keeping track of which ball mount fits which coupler. CURT has made things simpler with the multi tow ball mount. These ball mounts feature two or three trailer balls mounted onto a straight shank to accommodate various