Kind of a tricky find, since the neutral was good to all the rest of the trailer.
The use of electrical tape - the devil's own invention - tells me that the box was re-wired by an untrained amateur, not by any kind of pro in the factory. And that suggests to me that he simply poked the wires straight into the wire nut and twisted the nut, without pre-twisting the wires. A common error, and you experienced the common result. Again, good find.
Bill
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