I made the plywood bracket to prevent the power cord from doing damage to the
converter and circuit breaker/fuse box.

It is a simple construction and fits into the compartment under the rear seat.

Once screwed into place I added a few strain reliefs to the power cord. You can see how
the bracket separates the power cord area from the converter and circuit breaker box.

I added a lid to the top to finish it off. The lid is easy to remove just in case.

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Overkill perhaps but I wrapped a piece of tape around the cord to let me know
when the cord is just about fully extended.