Here’s some wild guesses until some one comes along…….
Night lights (usually found under the counter near the floor)
Water pump switch (in case you’re dry camping and forgot to turn it on)
Under the expensive (previous owner) categories……
Activates “OCCUPIED” sign?
Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain