Can't use it with a GFI outlet. It will trip.
Even if it did work, you end up with 30 amps on one leg and 20 amps on the other. If you try and run the second AC it likely will stall on the 20 since they are usually split on each leg.
The cheaters are really meant for two 30amp feeds. Even though you can adapt them down.
Also depending how the pedestal panel is wired from the parks main feed, you can overload the pedestal running on both feeds at the same time. They are set up to run only one at a time on each site. OK if the second is from another site with a separate feed.
Bill
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