Looking at pictures of your trailer online, it seems that your entertainment center setup is similar to ours. Look on the back of the TV wall in the bedroom. You should see where the coax cable is connected, possibly with a 12V plug too. There's a little black push button on the faceplate for these connections. Just a suggestion...
Dave & Sue
Kiley & Emily
Izzie (Beagle/Bichon/Mini Poodle)
2012 Ford F150 XLT EB SS CRW 6.5 Max Tow
'12 Dutchmen Kodiak 284BHSL