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[ComputerChips]

10scDust
All properly wired 30 amp Single pole circuit outlets are the same by code.
The household circuit you described is a Double pole 30 amp. In most localities this is 2 hots and a ground. Most appliances that use this don't need a neutral. Some localities require a 4th conductor so that you have a ground and a neutral. Each plug/cord pair is designed with unique prong setup, so that when done to code, you will not be able to plug in to the wrong type of power supply outlet. Some people have learned the hard way when they convert a 30 amp double pole outlet to a 30 single pole outlet and do not change the breaker and wiring to be a single pole 30. They plug the camper in and fry everything with 220 volts cause the white wire is hot instead of being a neutral.
The 50 amp adapter just connects both hot prongs to the one hot leg on the 30 amp single pole supply. You can run everything in the camper.... just not at the same time.