In general, if you are going to run the fridge when the trailer closed, there is very poor air circulation removing heat from the fridge, so the fan is necessary in this situation. However, many of us just put some frozen ice packs in the fridge compartment when travelling during the day and don't bother with running the fridge while travelling.
All in all, I rarely use the fridge fan, but it can help with cooling the fridge.
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