If i was making a electric drive motorhome, i would never use a truck chassis.
Without the engine and drive train a much better and lower motorhome could be built.
Basically just build a steel truss box, attach wheels.

Further, Bollinger is missing one of the most important things for electric vehicles.
Short run hauling / deliveries.

The big thing is that the owner has an industrial building with large transformers where the fleet can be charged overnight.

And the savings is that the owner saves on maintenance costs involved with gasoline engines.