This hitch came with the trailer. We've got the equalizer bars hooked up, though it's still low in the back :/

I can't figure out what that ball and arm are for. I'm thinking it's a sway control, or shock absorber or something but I don't know how to use it, and there isnt a label on the hitch so I cant google it.
Funny thing, I was sitting at the toll booth yesterday and the guy in the next lane had the EXACT same hitch, with the one shiny little ball any everything. Leaving today or tomorrow, would like to have everything hooked up if I can figure it out! That arm doesnt move, may be rusty or something...??