Not to be rude but my question was to someone who owns a RoadTrek CS with the Norcold Unit. As a full-time I know how to connect a Propane Generator.
As a Firefighter I have run Tanker and Engine for over 10 Hours on idle, on all fire scene all equipment is always running with or without load no problem !
On my Class C with a generator the fridge is on Propane or 110v and it must have 12 volt to control the CPU.
My Question is without starting the propane generator and going down the road is the fridge on the invertor if it is the standard CS only has a 750W unit and will not support the fridge. The RV batteries are isolated from the engine unless you option for the 3500engine/2500 invertor I think?