The thing about "extension" cords is that you are making the distance longer than originally designed. With Voltage, that means that the voltage at the RV has a probability of being lower than the RV expects, thus starting a whole electrical issue.
Extension cord conductors HAVE to be sized correctly, such that the voltage and current that arrives at the RV power center is within the 2-4% that most designers expect power to fluctuate.
There are a lot of good electrical heads on this forum that can get very deep into this, but the take away is try NOT to use an extension cord on top of the RV power cord, and if you have to, spend the money for the Correct conductor size cords.
Just my 2 cents,
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Recie Tyson
2016 Thor Hurricane 29M
Lancaster, CA
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