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It really depends on the context and the country. In practice, most people in my country live within 100 km of a commercial harbor (river or sea), so 320km for most foreign imports it seems enough. Grocery store chains have to be within 2 hours from the packing center, so for food too, 320km seems enough. Barely, but enough).

It's optimised for distance to and from the depot and in-city store locations. Presumably it charges at the depot while loading.

Trucks have a lot more space for batteries, so with EV trucks it's all about balancing range and weight for the task. More range means less useful load.

Some Australian electric prime movers (truck that pulls the load on trailers) are using a fork lift in / fork lift out swappable giant battery pack - 10 minute change over from truck to charging station, freshly charged unit back to truck.

https://januselectric.com/

320km must be either optimised for their trip or an older model.

Watch some of these https://www.youtube.com/channel/UCXNB7Q_d1qC0mFjn6bt8YvQ

320km seems like a very long distance to go without a rest stop.