Hi Dblboinger,
Welcome to the Heartland Owners Forum.
The Bighorn internal satellite coax has separate lines going to the bedroom and to the living room. As with a residence, Dish would expect a receiver to be placed in each location. Recent Dish Tailgater's may support 2 receivers, but I'm not sure the older units did.
In the Universal Docking Center (UDC), you'll find 4 coax connectors in a row, above the water connections. They are paired. 1/2 of each pair goes to the roof to support installation of a Winegard Trav'ler. The other 1/2 of each pair goes to either bedroom or living room.
Some people have managed to get satellite in both locations from a single receiver, if the receiver has coax output. The output can be split so one leg goes to the living room TV and the other leg gets plugged into the coax connector that carries the Cable/Antenna signal.
Another method is to use a wireless transmitter/receiver pair to supply a signal to the 2nd TV. Assuming a remote control with RF rather than IR, the Dish channel could be selected from the room away from the receiver.