This Receiver and Coupler Set is made of stainless steel, includes a receiver lock for 2" x 2" receivers with a 5/8" pin that fits Class III hitches, and has a coupler lock that fits all surge brake couplers with up to 3-1/2" span.
TRIMAX STAINLESS STEEL SXT3 - 5/5" Receiver & SXTC3 - 3-1/2" Span Coupler Lock
TRIMAX STAINLESS STEEL SXT3 - 5/5" Receiver & SXTC3 - 3-1/2" Span Coupler Lock