Some tow vehicles will not allow current that charges the trailer battery to flow through the trailer connector unless the ignition switch is on. Check your owner's manual or ask your dealer. Mine does this, but I still unplug when I remember it.
There are energy management systems that can be mounted in a hidden location, which have a remote display connected by a data cord.
https://www.progressiveindustries.net/ems-hw30c
ps:
The easiest place to install the EMS is close to the existing power cord connection to the distribution panel.
There may be space directly behind the distribution panel. (thinking about mine, not knowing about yours)