Top of the line sway and torsion control system from Equal-i-zer bought in April 2014. Cost $1000 plus tax. Used one and a half camping seasons. Rated for up to 400 lb tongue weight and 4000 lb loaded trailer weight. Comes with 2" ball. Easy to install and remove and does not have to be removed to back up your trailer. Reason for selling....going to a larger trailer over the weight limit.