Those are puddle lights and not just on tow mirrors. I have them on my Big Horn.It is a small square window under the mirror for a LED to shine down the side of the truck.
I believe they are only available on the Tow Mirrors.
My '21 Laramie is coming with the Tow Package and Power Folding Tow Mirrors.
Malodave
Puddle light are underneath pointed down. The Reverse LEDs are facing Backwards.Those are puddle lights and not just on tow mirrors. I have them on my Big Horn.
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I thought it was strange too.But it could hurt your night vision if it did that.It would be awesome if the Tazer DT enabled these on reverse all of the time instead of having to push the cargo button each time.