I hope Tesla builds the next gen USPS delivery trucks to replace all of those loud little trucks that sound like a space shuttle launch between each mailbox.
Germany's biggest postal service, the Deutsche Post (ex state monopolist) searched for an electric delivery van and couldn't find one. So they bought a startup and developed their own:
A hybrid would well-suit the replacement of these. Something like the Chevy Volt that relies more on electricity for heavy stop/start type driving. It would also address your concerns. The engine could just run when needed to charge, and not be a constant oscillation through the RPM range through the neighborhood.