When I looked at your particular model RV at the FR website for the current year:
I was looking at the pics there, and see this one. You could possibly have a residential refrigerator, that does indeed need an inverter to operate properly when not connected to shore power (this is also explained in the "converter/inverter" link I posted above).
Maybe someone with these type RV's will chime in and answer your question. I moved your post to the appropriate Vibe subsection to get more attention and answers to your particular RV model.