If you are concerned about people getting into it, if you decide to put it outside, you can consider getting a small chest freezer instead.
Then, you can use a temperature controller like this -
https://www.amazon.com/Inkbird-Itc-3.../dp/B01MDSWXY4
The freezer plugs into the controller, and you put the controller's probe into the freezer, and then just set what temp you want on the controller. You can use the chest freezer as a regular refrigator using this method, since the external temp controller will act as the thermostat, rather than the freezer's thermostat.
And, chest freezers tend to have locks on them :-) So no one getting into your beer while your not at your camper.