This appears to be the television connector and 12VDC cigarette lighter socket on a Swift SLX 184BH for your OTA TV unit mounted next to the entrance door. The middle TV jack panel... The BLACK button on this panel applies 12VDC to the roof mounted antenna pre-amp. You would plug your HDTV cable into this "F" connector and push in the black button where you will see a green light come on... I didnt notice the year of this Swift 184BH...
This Photo is from the video someone else submitted to you in your other thread. Have you located your TV PANEL yet. What is year of your trailer
Roy Ken