Depends.
- Brakes are often direct wired to the battery thru the emergency breakaway switch, so it doesn't accidentally get disconnected while towing.
- Propane detectors, you don't want them accidentally disconnected.
- Solar often bypasses the 12v panel, so it can keep the battery charged when in storage.
- Inverters may have their own connection to the battery, so it can be placed close to the battery bank. Long runs of 12v at high amperage tend to have big voltage drop.
If you want to be sure everything is disconnected in storage, put in a disconnect at the battery that disconnects everything at the battery terminal.