Thanks for the kind words. Yep what you describe I classify as a "multi wire branch circuit". On those a common Neutral serves a split duplex receptacle where Phase A feeds the top outlet and Phase B the bottom. Since the two are 180 out of phase if both outlets current were the same, the Neutral current would be zero. Unlike yours, my Onan has only one outlet, a 120 volt 30 amp RV type.