Question regarding satellite signal through coax outlet

Hi all, got our first travel trailer a few months back. 29 ft Cruiser Crossroad and we love it. Decided to get a king tailgater portable satellite to run when we are on the road. The dish won't be mounted so we will have to setup each stop. Now, my question is, what is the difference in the coax inputs on the outside of the trailer. I have one for satellite and one for cable towards the rear of the rig. I also have another input towards the center on one side, and one of the side with the door. My instincts tell me the satellite input is the one to use but what are all the others for? I also was warned that sometimes the signal from the satellite won't go through if there is a splitter or relay in the trailer. Any experience with this? Thanks for the help in advance.

--Rex