Help Identifying things in my RV

While I can't help with your questions, I can point out that all vehicles manufactured these days have available a long list of optional stuff, some of which may be on yours, and some of which won't be. However, to save money in the process of building them, they make them all with the same wiring harness, which will have plugs various places for those optional devices. To the extent you don't have a specific option, you will have the wires and the plugs needed to install it, but they'll be empty with wires leading nowhere useful. My guess is that you've found three such, and it is possible that plugging the correct device into that connector might give you a fully functional thing. But it is also possible that whatever goes on the other end isn't there, and you'll get nothing. Good luck learning about those things. May they lead you only to great delight.