The pictures are OK.
A few things:
I see 2 white romex cables which enter the interior skin. Looks like factory installed.
The black romex does not appear to go behind the skin. Looks like a PO install. Does this romex go to the screw in fuse holder?
It is not connected in the power panel. Correct?
To me this looks like the original power panel that a PO tried to modify.
Do you know how to use a multi meter?
It appears to me that this is a split buss panel. Meaning the large terminal screw on the upper right with the black shore power conductor is connected is only feeding power to the circuit breaker on the right. The 20 amp unit.
The large screw on the left should power the circuit breaker on the left. If I am correct in my assumption.
Which means the left circuit breaker is not powered at this time.
You could easily check it with a meter.
A technical note.
This is not a fuse panel. It is commonly called a power distribution panel. There are no fuses in this panel. It has circuit breakers.
For use in your coach it is wired for 120 volts AC.
Can you identify where the wires go from the screw base fuse holder?
At first glance I would recommend a larger power distribution panel. Giving you the ability to have a MAIN circuit breaker along with a proper neutral buss as well as a proper ground buss.
What you have is a real hodge podge.
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