theres a stub welded to the top of the tube that runs through the bumper about the point where the kickers are welded. Its got a quick release pin so it can be removed and the tube that goes through the bumper has been worked so it's now like a reciever with a bolt through it so it too can be removed. A chrome vinyl magnet over the hole in the bumper and nobody can tell.
a pic of the parts to it removed to give ya an idea, the other 2 tubes are for the window net