Inevitably, on hot days I forget to switch from 12V to propane when I stop, and the trailer's batteries start to fade remarkably fast. And with the fridge on DC while driving, the battery charges very slowly.
So now I mostly use the 12V when I am required to have the propane off - like on ferries. Before I do that, I set the fridge for lower temperature for a while. On 12V, I go to a higher temperature so the fridge doesn't need to work so hard.
2009 17' Plan B