Looks like the charge indicator when plugged into the GMC portable that comes with the truck. As it charges the headlights have blue LEDs that indicate the charge status from outside the truck. There's a setting to turn it off (I found it after my neighbors complained it was keeping them up at...
I have been looking at one of these to replace the stupid I-Bar storage bin under my rear seat, as near as I can tell the dimensions (based on Tuffy's website) are identical. I am not worried about having to drill mounting holes in the box if it comes to it, however it really looks like a drop...
I run this style in all my vehicles, it is just unfortunate that this one comes with such a stupid name (PIGenious? 🤦♂️ ). I bought it during prime day for $29, however it has gone back to full price:
Pig Enus sunshade
I was looking at installing a hood mount solar panel (the kind that glues to a vinyl pad) to keep the 12v battery charged. I figured it might also keep up with a small portable camp fridge.