[BB_TX]

I haven't, but being both are 30 amp connectors there should be no problem. It is the ones with one 15/20 amp being the problem as the 15/20 is typically a GFCI outlet that will trip.

But one caveat. If both 30 amp outlets are on the same hot phase, it is possible that if both 30 legs are used near their maximum current that you could exceed the 50 amp rating of the neutral wire. You would probably not normally be pulling a total of over 50 amps combined from the two, but it is possible. If the two 30 amp outlets are on different phases, then there is no concern as the neutral could never exceed 30 amps.

The two hot legs on the same phase are additive on the neutral wire. Meaning the neutral carries the total current of both hot legs. On standard 50 amp split phase, the neutral current is reduced by the difference between the two hot legs and never exceeds the 50 amp rating of each leg.