The Honda has a floating neutral which is different from shore power.
Some RVs have a power management gizmo that thinks something is wrong if it is on a floating neutral.
Without that gizmo, the RV shore power cable can go into the Honda and everything is fine.
If you have such a gizmo, it can be by-passed when on the Honda (I don't know how, don't have one) or you can make a funny adapter to go in the Honda receptacle that makes it look like regular shore power to what you stick in the funny adapter.
