B&W Tow and Stow Class V Dual Ball Mount, 2 in., 2.5/16 in. Ball Diameters, 2-1/2 in. Rec, 7 in. Drop, TS20040B at Tractor Supply Co.
Amazon.com: OPENROAD Adjustable Trailer Hitch Ball Mount Fits 2-Inch Receiver, 2" Tow Balls 7500lbs, 9-1/2" Drop/ 8-1/4" Rise Drop Hitch, Tow Hitch for Heavy Duty Truck with Stainless Steel Pins and Lock :
Blue Ox Adjustable Class V Fits 2 1/2in Receiver, 12,000lbs Gross Trailer and 1200lbs Tongue Capacity Trailer Hitch Mount