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I have one of those square hitch units that will take a variety of hitch *****, etc. I have seen a variety of things out on hitch mains like propellers, school emblems, Ford ovals, etc.
I have a Ford oval that lights up with the lights at night and also works with the brakelights, it is a fourth brakelight down low. If I remember right, I found it with trailer hitch section at Meijer's or Tractor Supply.