This may be a bit had to follow in the pictures but I will try and explain my set up.
I have Directv, campground cable, trailer antenna analog, and trailer antenna Digital all feeding one TV.
First I installed a connector on the outside of the trailer just below the cabinet in the living room. This cable was feed up to the white plate that is attached to the top of the cabinet, see picture. I use this connection for my Satellite and campground cable inputs. If you study the picture you will see that there is a splitter just to the right of this connector on the table top. One wire from that splitter goes directly to the TV via the 3 way splitter, and feeds the campground signal to the TV. The other wire from that splitter goes to the satellite box, closest to the wall, and is used for Satellite viewing. A wire from the satellite box goes to the 3 way splitter and in turn to the TV.
With the new digital broadcasting I have installed my digital converter box, strapped to the wall in front of the Satellite box. The wire from the trailer antenna goes to this box. My digital box will pass either analog or digital signal and the output from this box goes to the 3 way splitter.
This system gives me complete freedom but only supplies the one TV. I would assume if you could isolate the wire that feeds the rear TV and attach it to the extra connection on the 3 way splitter you could use all systems on the rear TV. The only problem would be the all controlling of the rear TV would be through the living room and you could not watch different programing at the same time.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles