Most all of the RV TRAILER will have what is called a TV WALL PLATE that looks like this...
Google image
Most everyone will refer to this as the booster amplifier for their BATWING Antenna. This is really just a switch unit that send DC VOLTAGE up to the RV ANTENNA that has a BOOSTER AMPLIFIER built-in to their roof mounted antenna.
When the light is 'ON' on this panel then the CABLE TV INPUTS to the trailer is muted...
Google image
This is available from AMAZON...
Like others have said you may have to look around where this TV WALL PLATE is installed...
Roy Ken
