This is being tested in the real world. Big trucks can't be charged with a regular car charger. They need so-called megawatt chargers.
The first charging station (with 40 chargers) for this project opened in September, 2025. I have here an article by Heavy Duty trucking which documents a 480Km journey that a Windrose R700 Electric Semitrailer made. The Windrose truck model is for actually for sale in Australia with a price in $AU of $450K. See here
According to this article, Daimler Truck will also be involved and already has a fleet operator lined up, which will start operating trucks from May, 2026.
This is the best example I could find of charging stations actually operating.
I found two articles from September, 2025, announcing the opening of the first of five chargers:
I haven't been able to find an update on its actual usage.
This looks promising but there is no mass roll-out, yet. Nevertheless:
The technology is real and trucks are available. It is definitely realistic to roll this out here. One charging station in Sydney, one in Melbourne and one in between would probably be the bare minimum for the Sydney to Melbourne route.