On my 2015 legacy, the furnace has vents throughout the coach, including the bedroom and bath. I just use the zone 1 furnace to heat the entire coach. I have en electric fireplace with infrared heater to supplement the heat if needed.
I have a 5th wheel camper with two zone heating and cooling and it is the same as other. For heating you just set zone 1 and that heats your camper. For cooling you can set zone 1 different from zone 2. My zone 2 is the bedroom so I leave it off a lot unless it is very hot. My camper is ducted through out the whole camper and the AC from zone 1 will cool zone 2 and vice versa. Hope this helps.
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Freddie & Linda
2017 Sunseeker 2010DS on 2016 Ford E450
2011 Nissan Rogue (Toad)
Former: 2015 FR Sierra 5th wheel