Tag Page TruckMystery

What are these little poles on the back of trucks?

I keep seeing these stick-like things on the back of almost every pickup truck around here. It’s like a short metal pole with a little box or cap on top that looks plastic? No visible wires or lights that I can tell. I live in North Texas, if that helps. What are these? Curious and slightly confused 😂 #TruckMystery #NorthTexas #WhatIsThis #TruckMods #HelpMeOut #CarQuestion #SpottedInTheWild #RandomTexasStuff