30 amp RV twist lock adapter plug. 125V
Your Honda generators 120V 30 amp 3 prong plug in is a twist lock receptacle. Your RV has the straight prongs.
This "RV Adapter" plugs into your generator's 30 amp twist and has a female 30 amp on the receiving end to convert it to the right connector.
Popular accessory for the Honda EU3000is and EU2000i Companion generators.