Not sure if all 4 tv's are actually connected together by coax (off of the main), or if so if its shared signal would even be strong enough to service all 4.
Regardless, to take advantage of their HD picture capability, and allow 4 tv’s to watch 2 separate shows (I’ve paired them 2 by 2), here’s what I* added…
A second coax input (at the outside service bay) which runs under trailer belly and terminates at the garage tv area. Including the one standard run to the main tv area, that’s 2 total. I get programming via a portable HD satellite dish; I place it ground level on a tripod stand wherever I camp (piece of cake). I run 2 coax cables for 2 program feeds from the dish to the RV (@service bay).
Pair 1: At main tv area, connect coax to HD receiver. HDMI out of receiver to an HDMI splitter; one HDMI goes to main tv, the other to bedroom tv. (Yes, HDMI cables had to be run through ceiling and walls – they don’t come standard). The 2 tv’s may only watch the same show, but I can change the channel from either the main area or the bedroom. Either one or both tv’s can be on at same time.
Pair 2: At garage area, connect coax to a second HD receiver. HDMI out of receiver to an HDMI splitter; one HDMI goes to the garage tv, the other to the exterior tv. (Again, HDMI cables had to be run to each tv). The 2 tv’s may only watch the same show. Either one or both tv’s can be on at same time.
Note re sound in main area: HDMI carries audio and video on same cable. With HDMI in to main tv, optical cable out of tv and in to built-in entertainment system (wired up standard in my 2012 3905) will allow you to get sound via surround sound system in main area.
*I paid my dealer to do this cabling work at purchase (I just spec’d it out)
Hope all that was fairly clear and helpful.
2012 Voltage 3905 EPIC
2012 Ram 3500HD CTD CC LB DRW 4x4
2011 Suzuki RMZ250F
2010 Yamaha YZ125