It can be hard to determine what is best. Consider the situation of your customers. Are a good portion elderly or perhaps without the benefit of transportation and therefore possibly unable to travel a longer distance to obtain the services that you provide to them? If that is the case, as it can be with community banks, you might wish to consider a temporary facility to better serve your customer base.
You also might wish to consider the type of emergencies that can arise calling for the closing of the bank. If it is a natural disaster that destroys a large portion of the community, (such as the tornado that hit Moore, OK a few years ago) it could be very important to bring a temporary facility to the community. In a case like that, if you don't make the effort, you might lose customers to the other bank in town that does. People remember the extra effort and kindness shown them during the low points of their lives.
Whatever your institution chooses in this instance, best of luck and may no disaster ever touch you that would cause your plan to need come into effect.
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I have many opinions; some are good, some are bad, and some don't contradict.