Here is neat pictorial that may identify things...
If all fails then go get a 15-20 foot RG cable and hook that to your TV INPUT directly on the TV and run the cable out the door or window to the pedestal to CABLE TV jack...
This will bypass all of the wiring inside the trailer until you figure out what you need to to to get TV going.
When you hookup to the TV jack then you have to go to the TV menu and select CABLE and then run the TV scan. You have to do this at every camp ground you go to...
If you are hooked up to the OTA Antenna then you have to select ANTENNA from the TV menu...
This is what we all go through before we go camping in our RV's do all of this in the back yard haha...
Roy Ken