I know this is WAY late to the discussion, but all of this is ignoring the way the neutral needs to be wired. When hooked to shore power, all loads MUST have their neutrals NOT connected to ground in the RV, or any ground fault breaker supplying the RV will trip. Immediately.I don't know how Winnie wires the front/rear A/C switch, but here's the way our previous Coachmen was wired. The diagram includes a mod I made that allowed me to plug the front A/C with an extension cord plugged into the shorepower's 15/20 amp utility outlet when the rear A/C was selected and powered by the 30 amp shorepower. With the setup shown, removing the selector switch and hard wiring both A/C's to the 30 amp side would create a direct back feed through the generator's 20 amp breaker, causing it to trip. The ATS does not switch that leg...
The RV's onboard generator provides the ground and neutral path when in use - no need to alter the RV wiring. When using an external generator, that generator either provides a ground & neutral path or a generator bonding plug is used between RV shore cord and generator to simulate it.When on the generator, the RV neutral MUST be grounded inside the RV somewhere or the resulting floating voltages will destroy TVs and things.