FWIW here is a link from a thread on this topic from a number of years ago.
From what I recall the RV has a grounded circuit/system because of generator etc... and when plugged into the GFCI at home the home circuit is picking up the RV circuit as a short to ground and tripping the house GFCI breaker. Known problem with plugging RVs into house 15amp GFCI protected outlets for years.
https://www.thorforums.com/forums/f8...tlet-5473.html
I am not an electrician or a subject matter expert on electricity so you have my disclaimer.
Happy reading.
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