Am electrician and live in a double-wide so I haven’t tinkered with it beyond swapping some devices. Feels good to be able to just do stuff like this, as simple as it is. I was not raised to be very handy so learning all this has been a deliberate process.
Uh, this doesn’t count as a legal, professional consultation and you should always seek a licensed professional when it comes to electricity in your home.
We moved into a double wide decades back, it had double gang boxes with single plugs on every wall, and At the time, a double gang plate with a single receptacle plate merged with a blank plate, was impossible to find, so the builder had left them all open. Like WTF.