wysiwyg, I don't know a specific reason for attaching the cutoff switch to positive battery conductor vs negative.
My DPST switch is on the positive conductor and it has 3 positions (battery, (shore) power supply, and off). If you install a converter or 12vdc power supply (as I have done) at some point, you will probably want to do what I have done, i.e., LP detector ON using battery power or shore power if either are available.
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