Of course, cost will be a huge issue here.
Camper vans are not known for amazing aerodynamics, so to get that 200 miles of range, you need a lot of battery. Looks like the Chanje V8100 is claiming 150 miles on the HD-UDDS with 100 kWh of battery (so, probably a lot less range in the real world on the highway).
So, I'm thinking about 200 kWh is about right - 1 kWh/mi. (For comparison, a Tesla Model X 100D is at 390 Wh/mi EPA, and Tesla claims the Semi can do under 2 kWh/mi fully loaded.)