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David,
If you have anything on in the trailer when you pull out the extention cord it will spark. this is normal (not good but normal). The more current you draw the bigger the spark. You should turn the CG breaker off any time you plug in or unplug the trailer. If your wife said it was a big spark other loads could be on that you are unaware of, (water heater etc.). Also ask her if the plug was hot. Good luck in your quest.
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