Refrig DC Operation Question

[Joesplace]

Since I am new to RV life, please help me understand the refrigerator DC operation.

I assume this mode is usually used while traveling. Cool the refrig prior to traveling in propane or 115AC mode then use on DC to maintain cooling?

So, what about the refrig fan? Nothing in the Norcold manual about this but I guess it's used to draw heat out while trailer is closed and refrig is on DC operation. Is this fan thermostat controlled or just on 24/7 while switch is in on position. Should the fan be used in anything other than DC mode?

Thanks . . .