I hear you Ernest. I wanted to add a HDMI cable to the rear of our TV so I could add a SAT receiver. It is possible but not a fun task. As I recall, I needed to remove the electric front window shades, remove the curtain track, then remove the center overhead "upholstered" trim piece.Sort of sitting on the dash, you can then get your arm into the cavity behind the TV and feel around for the plug. Not easy but I did it and a couple people I've given this example have done it too. When I hung our new TV up front, I bought cables for every single connector on the TV and just have them sitting in the entertainment cabinet for potential "future" use...
2008 Berkshire 360QS
with Mercedes Power
2010 Mini Cooper Convertible toad
2015 Nissan Frontier 4x4 pickup toad