Without knowing exactly what wiring you have, I'm guessing you have only one incoming cable with a jack on the side of your trailer. If so, you can do this modification. It works great, and allows you to use either your satellite or park cable by simply making a change of connections at the inside wall plate. Basically, the mod takes your incoming cable and separates it off, away from the antenna power supply. So it becomes just a plain cable available for you to hook to. Then, when you want to use park cable TV instead, you connect a short jumper cable across the front of the plate to connect the incoming cable back to where it was originally hooked from the factory. I've done this mod, and used it with a tailgater. It works.
FR has just started doing a version of this on the Sunseeker Class Cs.