CURT 14,000 lbs. 6 in. Drop Adjustable Trailer Hitch Channel Mount with Dual Ball (2 in. Shank) 45900 - The Home Depot
Bomgaars : Curt Manufacturing Multi-Ball Mount (2 Inch Hollow Shank, 1-7/8 Inch, 2 Inch & 2-5/16 Inch, Chrome) : Ball Mount
Amazon.com: REYSUN Trailer Hitch Tri Ball Mount with Hook, Tactical Tow Hook, Fits 2 inch Hitch Receiver, Secure with Self-Lock Latch, Matt Black : Automotive
CURT 10,000 lbs. 5-3/4 in. Drop Adjustable Trailer Hitch Tri-Ball Mount with 1-7/8 in. 2 in. & 2-5/16 in. Balls (2 in. Shank) 45799 - The Home Depot