Utilizing Refrigerator While Driving to RV Park

So I did actually get a hold of the demo person and he said that with our unit to plug the power cord into the receptacle in the back compartment and then set the refrigerator to "automatic" and it will know to use the electric as power source and charge our battery at same time. The frig can run off of LP gas or electric. Previously we had a travel trailer and always waited until we got to the site before powering up the refrigerator.