I’ve been trying to figure out what this connector is and everyone has no clue. There isn’t enough identifying information to find anything on google. All I see is a label “lwai”. It’s located in a panel with power outlets, rj45 jacks, and some audio jacks. I think I found that it might be related to some hvac system but I can’t find any description or picture that confirms that.
Looking at the keys in the socket, I don't think that it is meant for a trailer power cable. It seems to be a dock connector to supply a docked boat with power.
Picture comes from this page.
That seems to be an industrial plug power, I saw something similar in a milk factory. That can provide highter voltage than a regular plug.