Camping without a battery?

[Famof4]

So I just said a hello in the new member check in and now I am asking my first question.

We recently had our battery stolen while the trailer was in storage. We are wondering if it is worth replacing it or not. We (currently) camp only in state park campgrounds that have electrical service. We thought we needed to replace it for the purposes of powering the breakaway switch. But found out quickly that wasn't the case.

So here are the questions. Does anyone not have a battery on their trailer? Is there something we are missing as to why we would need a battery?

I'd appreciate any insight. Thanks.