That is the Reese Dual Cam sway/wd set up, 1st generation. It has been around a long time and works quite well. It requires a Reese ball mount hitch head that accepts the trunnion ends of the lift bars. Very common, very good.
John and Susan in a 1993 34' Classic--Bonnie
pulled with a 2007 Dodge DRW Cummins --Clyde
12 Tires on the ground
Go often to the house of a friend, for weeds choke the unused path........Emerson