Excellent post.
A few things I can think of, but it might not be any of them:
Thermostat draws a bit. Again, not enough to mess you up the way you were messed up.
My inverter does some odd 'tap' at preset occasions to check out the system.
I think my bird or whatever that thing is often 'taps' to see where and why with the 12v.
Some radios have an always hot which might not have a fuse anywhere but in line.
You didn't tell us the status of your fridge. It uses 12v even when on propane.
The o2 co2 gas monitor uses 12v and I don't know that it's fused.
My bins have the stupidest lights in them. On off switch right on the light, and I don't think they're fused. If I left one on, they'd not draw much but they'd kill a battery.
My overhead bed ALWAYS has the nine blink, bad ground display. That has to use some 12v.
My outside TV always has a little light on. Even when it's off, there's a light on.
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