Hi Kblock108,
Before trying out the trailer's internal cabling, try connecting the dish directly to the receiver and get it working. Once it's working, then move the wires around to use the trailer's wiring. You should be connecting the dish to the satellite connection near the plumbing. The receiver should be connected to the living room connection not used for TV/cable.
Sometimes the connections are hooked up wrong, or if you're not the original owner, they may have been moved or modified. Barring a cable or connector failure, trying the 4 possible combinations ought to get you there - once you've gotten the receiver and dish to work with a direct connection.