As stated on the websites selling these - they won't work if the outlets being plugged into are GFCI protected. Most campground 15/20A outlets are (should be!) GFCI protected...
The Y adapters merge the neutral/ground contacts across the 2 circuits - and appears to a GFCI to be a ground fault that it is designed to protect against. It will sense the imbalance due to usage on the other leg and trip.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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