That so-called thing-a-ma-bobber is a rear light indicator for when you're towing your rig. It tells you in the mirror if all of your lights are working when you apply the brakes or use the turn signal. Pretty cool feature especially if you're traveling by yourself.
FF
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4CU 2699 / AIR 10 / TAC AZ-1
I'm haunted by aluminum.
Charter Member of the 4 Corners Unit.
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