Our Wildwood XL Lite RLXL does not have a battery cut-off switch. I've debated if it is worth the $$$ and my time to install one. At home, the trailer is always plugged in. On the road, the vehicle applies 12V to the trailer system. And in most places where we camp, there is a 120-volt service available.
The only reason I can see for a battery disconnect switch is in an emergency where we would need the 12V cut off immediately. Otherwise, I would just remove the negative battery cable.
Of course, if one does not have power available, especially for storage, then a battery cut-off switch does, or should, remove any parasitic loads. At the same time, if solar is available, then one must understand how the system is configured with regard to how the solar system charges the batteries. There are several ways to apply solar charging technology. I know I have my preferences. In other words, the battery disconnect switch should totally disconnect the battery. Thus solar is a different energy source just like the converter is a different energy source.
This is one topic I view could be debated for eons and eons.
Bob
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