This is a schematic of a RV30A (M) to RV50A (F) ADAPTER. Note that the 50A TWO HOT WIRES are tied together to allow the SINGLE 30A HOT WIRE to feed both 50A ZONEs in the RV WIRING SETUP,
DRAWING FROM DMBRUSS
Both 120AC 50ANP ZONES will be fed a 30A ource to be hared with all 120VAC items. You will have to watch what is turned on at the same time otherwise you will be tripping the 30A SOURCE Circuit Breaker.