On trailers that have 4 coax connectors in a row, and a 5th by itself, the 4 are for satellite. The 5th is Cable TV. Typically the 4 satellite connectors are divided into 2 pairs. One of each pair goes to pre-wiring in the roof that can be used with a rooftop satellite installation. The other of each pair goes to a destination inside; usually the living area entertainment center, and the bedroom. There may be a diagram on a large label on the inside of your basement door, or near the connectors.
If there's no diagram, you may have to try each connector to find the correct one for the destination where your receiver is located.
Before trying out the internal wiring, run a cable through the window or door directly from dish to receiver and get things working. Then try out the internal wiring.