Large pusher conversions (Prevost, ForeTravel, Newell, etc) sometimes have Over the Road A/C units (separate) ac compressors to cool the "living" area of the coach while moving down the road. IIRC they usually have 2 or 3 extra A/C compressors - belt driven by the engine to run the compressors....no need for them to run a generator going down the road.
those that DONT have Over the Road A/C generally have large banks of (6-8) batteries and inverters than can support the rooftop or basement air conditioners, so they don't require running a generator while moving down the road.
The pusher (conversations) have upwards of 1/2 a dozen alternators to keep all those batteries charged while the inverters are powering the roof air and everything else in the coach....skip to the 9:05 minute mark.....count the alternators in this video of a 2015
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Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw -
Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over