Both uses are brilliant. Mind. Blown.
That cutout had my inverter controller installed there in my driver door....
View attachment 1920781
...but I now use another in the back.
So...I cut the additional circle in the cutout to accommodate the magnet on the back up a HAM radio speaker.
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Needed a spot for a dedicated speaker, and the door location means if I’m out of the truck on a trail, my open door will let me hear radio activity outside without having to blast the ears of passengers.View attachment 1920780