[anakaine]

Ever heard of diesel-electric drive trains? The vehicles have electric motors at the wheels and a much smaller then usual internal combustion engine that is an onboard generator.

You can have both at once. This is what happens with some trains, frequently happens in mining, and happens in some large industries. It is what occurs with hybrid electric vehicles.

The latest round of electric vehicles are getting 80km (50 miles) off the battery. That sort of thing is find for most of the service vehicle types you listed, and meets the requirements for greening a fleet and having alternative power options.