Hi LauraandRod,
Welcome to the Heartland Owners Forum.
First thing to do is run the coax from the dish directly to the receiver without using any of the trailer wiring. Once you get it working, then try out the trailer wiring.
In your Universal Docking Center (UDC), you probably have 4 coax connectors along the top. There's a pair for the living room entertainment center, and another pair for the bedroom. With each pair, the right-hand connector goes to the roof and the left-hand connector goes to the interior. If you were installing a Winegard Travl'r on the roof, you'd jumper those connectors. But with a ground-based dish, you connect to the appropriate connector.
I'm not sure about the G2, but it may be a SWM type in which case with a Directv Splitter that passes power to the dish, you can probably split the signal out to a receiver in both the living room and bedroom. But to start, pick one location.
The coax connectors in the living room are probably marked for satellite and Cable TV/over the air antenna. Connect from the one marked satellite to your Power Inserter, and from the Power Inserter to the receiver. Then connect the output of the receiver to the TV input.
It's pretty easy at the factory to get the cable connections mixed up. So you might have to try different combinations of connections in the UDC and in the living room.
