Just to be sure I'm thinking the same thing as you are when you say 'rear speakers'. Our 04 Allure has ceiling front/rear speakers, that only play from the in dash radio. This will have a setup option to 'fade' from front to back.
Our front TV has a Bose 3-2-1 that plays DVD/TV signals. Our rear TV only has the speakers in the TV itself, not connected to the ceiling speakers.
And the cockpit control that Dale is referring to. Should be a large row of buttons, probably in a Audio/Visual cabinet, that has buttons that say cable/antenna/etc. - I bet mine has close to 12 or more buttons on it... Those are what I think Dale is asking you if you have checked, to send the signal to the 'back TV'?
Good luck on your research on this, and if any of this prompts more questions - give us all another shot at it.
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...