Way over $600 for complete Sprinter installation.
Sportsmobile estimates total cost on their units around $5,000
https://sportsmobile.com/going-all-electric/
With new Ford and Chevy pricing, I’m fairly certain there’s going to be far more generator-less motorhome options similar to Coachmen Cross Trek in next couple of years. Some campers will still need built-in Onan generators, but many won’t.
The main reason to still have a generator at all is strictly to power an air conditioner or two for long periods without shore power.