the other option is to just use an extension cord from the outlet into your RV, plugging in things that can run off it versus the RV's main 30amp outlet. I've done this before too, when the GFCI outlet is the only other option close by - run an extension cord into the RV and plug in the griddle, heater, or basically anything that might draw a lot of power, to keep it from impacting the main RV electrical.
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