CURT Vertical Trailer Hitch Ball Mount, Fits 2-Inch Receiver, 4,000 lbs, 1-Inch Hole, 2-1/4-Inch Drop Model 45003CURT Vertical Trailer Hitch Ball Mount, Fits 2 Inch Receiver, 4,000 lbs, 1 Inch Hole, 2 1 4 Inch Drop Model 45003 The CURT vertical trailer hitch adapter is designed to turn a vertical receiver into a standard ball mount platform or horizontal receiver tube. A trailer hitch with a receiver tube that points down toward the ground is sometimes preferred on a vehicle because the hitch is then able to be completely hidden from view. With this design, a