You wouldn’t replace mail trucks individually, you would fully transition each location as a unit. Also, you overestimate the complexity of installing charging

You wouldn’t replace mail trucks individually, you would fully transition each location as a unit. Also, you overestimate the complexity of installing charging points. In many cases the parking will be directly against the post office building. In many cases you would only have to dig a small trench. In some cases you would string up a new overhead wire. When you’re doing 10 at a time, this isn’t complicated or expensive on a per vehicle basis.