Here's a link to a Cyclone coax layout that MAY be what your trailer has - if no modifications were made before you got it. And some people have reported that the diagram didn't match their trailer layout. So this is just a starting point.
Note that there a quite a few splitters in the cabling path in order to serve multiple TV locations. Some people have reported that the factory installed splitters were of the type used by Cable TV, and that they weren't rated for satellite frequencies. So you may have to either run some direct wiring, or change splitters.
It's also worth checking the coax connector crimps to make sure the connectors aren't loose and that there are no stray strands of the ground wire shorted to the center conductor.
And just as in homes, when there's a coax connector near the TV, you need a satellite receiver that hooks up to the coax on the wall, and the TV is then connected to the receiver.
The first time setting up, it's a good idea to run coax directly from the satellite dish to the receiver, without using the trailer wiring. After you get it working, then tie into the trailer wiring.