IMO Only way is out-of-sight and out-of mind.
My 2KW Honda is secured in the bed of my truck bed which also is lockable. My Honda Generator goes where I go.
'NO WAY WOULD I LEAVE MY HONDA 2KW GENERATOR AT A CAMPGROUND' unattended...
I pull it out onto my tailgate at 8AM each morning for three hours to re-charge my 255AH battery bank when camping off the power grid so that we can do all of this all over again the next day/night run off the batteries..
Been doing it this way since 2009
But this is only me talking...
Roy Ken