Why two thermostats?

My Reflection 5th wheel has two thermostats located within 8 feet from each other.   Why have two?   Does the hall way thermostat just control the furnace or can the furnace be controlled from either thermostat??   I have a 50amp coach with two AC's.   Is this possibly why there are two thermostats,  one for the main living area and one for the bedroom?  I can see the need for two in controlling two AC's  but apparently the furnace can only be controlled from the main living area thermostat.   Am I correct??