Missing Bypass Section
Your trailer may not be wired to match mine, but as far as I am aware, you should have a location that will allow you "splice" in a converter/decoder box so either satellite or cable signals can be made compatible with your TV. Find that spot and use a short section of cable to complete the wiring circuit from the exterior connection to the interior TV cable termination plate.
Here is a picture of my bypass cable. I was pulling new wire for another circuit when this picture was taken so the lower plate (where you would typically connect the TV & select cable or antenna with power boost) is removed.
"Good judgement comes from experience. Experience comes from bad judgement."
Air #48582, S/SO #003, WBCCI #4584