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.
Region 3 2ndVP
Go often to the house of a friend, for weeds choke the unused path........Emerson
Never pick a fight with an old man. If he is too old to fight he will just kill you.