I changed the dash radio in my previous 1999 pace arrow. Piece of cake, it used a standard single din automotive radio, I just spliced on the new connector for the new stere, used all the existing connections and speakers.
Also changed the bedroom tv, and added a dvd player back there. This was pretty easy too.
Some of these changes can get kinda involved though. Modern TV's are not the same shape as olders ones, and running new wiring, such as for home theater speakers, can be a bit of a chore.