Andy, welcome to the Forum.
I once had a 2007 Rockwood Signature Ultra Lite that was not the same model as yours, but may have had a similar wiring scheme.
As I recall, there were some almost hidden and nearly flush mounted small rocker switches located on the underside of a kitchen wall cabinet that was hung directly above the kitchen sink and/or stove top. You might try looking there in your unit, just in case you haven't already spotted and tried those switches.
2013 Rockwood 8329SS Diamond Package
2008 Ford F250 Lariat SD Crew Cab 4X4