Good feedback, all. Thanks! I'll be using one of those plugs but looks like I'll run the wire inside along the ceiling (I'll use those wire covers they used to use in old apartments as I'm afraid it may be pretty impossible to try to snake the wire inside the ceiling and then down a wall) in the bedroom down to a corner where I can go through the floor and mount the plug on the underside of the floor. Just happens to be right above the propane "cabinet" which has a bottom-less style floor in it so the cable coming from shore power will come right up through that cabinet and plug into the underside of the floor, totally not visible from the outside.
Now, anyone have any suggestions on an a/c unit? lol