We use the PI as well. I use a gun cable lock ( someone here posted a picture) wrapped around the power cord and run a cable through that to the power pedestal.
Ours has kept us safe several times. Just this past October on a pheasant hunting trip it let us know the pedestal had an open ground. Moved to a new site and all was well.
We also plug it in before we pull in to avoid the hassle.
Highly recommend this unit.
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