Diode based isolation is a one way device, it lets the alternator Charge the camper while the engine on, but keeps the camper from draining engine battery while camping, it does not charge the engine battery from the converter, too do that automatically requires a battery combiner system, its a two way charging control for charging house and engine batteries, from engine or generator/shore power, yet keeps them separated if there is no charging source available, the last thing most people want is to be boon docking someplace and have dead engine batteries ,
