Looks like my hydronic heat is controlled differently than yours. I found lots of information on the internet about my controls. Don't hesitate to call Aqua-Hot directly. 2004 to 2005 was a noticeable difference in construction and equipment.
As far as the TV, I did upgrade my bedroom TV it had a giant access panel deep in the corner of the rear closet. Nicely hidden and screwed in with tiny screws. Not sure what floor plan you have of the location of your TV.
Sorry I couldn't be quick help on the heat.
Good luck with the new coach...
2004 Country Coach Affinity Luxury Suite 45
C-15 Cat - Wife and Boston Terrier