Originally Posted by Mary F
Ours is for a 12v fan, to move the breeze if/when we're boondocking. Someone pointed out it can also be used (with a 12v/USB adapter) to power/recharge an electronic device, weather permitting (not usually a good idea to do outdoors)...
I always wished we had one on our Casita, and so we got it on the Escape. YMMV
We own a nice string of 12v LED rope lights. Great for clipping in the Casita belly band, for exterior light.
An exterior 12v outlet would make this easy.