Cheap DIY motorhome security device.

I have been told that a set of 4 parking sensors can be used to warn of an impending attack. One at both cab doors, one at the Hab door and one at a locker. Connected to a loud alarm they could work. They would need a remote fob to turn them on and off.
 
I have been told that a set of 4 parking sensors can be used to warn of an impending attack. One at both cab doors, one at the Hab door and one at a locker. Connected to a loud alarm they could work. They would need a remote fob to turn them on and off.
That's a neat idea, I wonder what kind of standing current a set of four takes because a flat battery could be an issue without solar or in the winter.
 

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