This is the "inlet" plug for the electrical supply for my trailer.
I'm trying to find an adapter or a cord, and so I'm posting this so that people in this forum I've been asking in can see what I'm talking about.
I don't know why it's so hard to find an adapter or a cord for this, but apparently it is.
An alternative would be to run a big orange power cord out the window and hook it up at the power post in a campground, and just get electricity that way.
Oh, well, whatever it takes!