[cagrove]

I have the exact same one as pictured. There is a flare on the end of the main arm that lines up with a slot in the receiver mounted on the trailer. When you rotate it to its "working"position, the flare holds it in the slot. To remove, just rotate the arm and the flare and slot line up for easy removal. Mine works great, very quick to put on and take off.

I got mine from Cabelas...looks like the same picture.

I hope this helps.