Well.. After realizing I couldn't splice into the cable for the Tailgater without finding the splitter up the line, I decided a different approach.
I drilled a hole in the night stand to feed the dish receiver from the Tailgater, then ran it down into the forward storage compartment. Installed exterior cable jack. From the receiver I have an Actiontec wifi transmitter that pushes the 3 other tv's we have to their own separate wifi receivers. So now all 4 tv's can display the satellite signal. Just all have to be on the same channel. Cable and digital antenna are still intact on the 3 interior tv's.