How do you keep your refrigerator fresh

[scottz]

When the refrigerator is off, how do you keep it fresh and keep it from mildewing? On our last trailer, we could prop the doors open. On this one, we cannot do that with the slides in. I know some keep the refer on all the time; I prefer not to do that. Someone suggested a small pan of charcoal briquettes in the refer and freezer. Any suggestions?

Thanks