Yeah that's the thing: With the current state of technology I think the ideal setup today would be a series and/or parallel hybrid RV with a battery bank large enough for 30-50 miles of slow travel.
The coach manufacturer could also utilize the high-voltage battery to power the coach's systems with an autostart on the main engine of the RV to re-charge the battery when low (If you think about it that auto-start could very well simply be the OEM's system that runs it when going down the road). Even running the A/C wouldn't be nearly close to the power draw that going down the highway would be.
It would be a win-win setup.
In a way car manufacturers are already doing this...Ever wonder why all the self-driving prototypes are hybrids or BEVs--all that computing power requires electricity.
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