Great chat Steve. Just for info to others who might wish to benefit from discussions here.
As I suspected you are wired correctly with 2 power legs @ 120v ea with 20 A per leg. But this limits any leg to 20A and could cause load imbalance and one leg of 20A might be insufficient at times. Depending on the load.
Hence, 20A per leg is likely marginal so if you use your adapter for 30A service from the 50A cord on the RV and rig it to plug into your 120v 30A twist connecter it will be the same as being plugged into a campground 30A service. With the switch in the 120v mode both fields of the genny stator will have the same current draw and the load would be balanced.
Best way to go in my opinion.
Regards
Bruce
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