Well...having fought this battle back in 2015...so I sure don't remember it all...
But in our 2015 Voltage Epic 3800...there is COAX cable between all four televisions. What that really means...I dunno.
Our Sony BlueRay device is only connected to the TV in the living area. Never tried with the TV outside. To be able to watch Movies...I moved the player into the bedroom and that's now the only TV its connected to.
We watch recorded programs on DirecTV. To be able to do that, I upgraded to the DirecTV Genie HDDVR. Then purchased through https://www.solidsignal.com
Two miniGenie devices. One for the bedroom and one that can be put in the Garage or the outside TV. I purchased an extra power supply so there is a mounted power supply in the Garage and outside TV compartment.
Don't know if you're going this direction. But thought I would post the "how I did it info"