what's wrong with the Australian road train setup?
This, and very much this.
There is legislation on the maximum length of artics in the UK, and having road-train-style vehicles is banned. I remember a few years ago a news article that Eddie Stobart (I think) were trialing oversized lorries that were technically too long for the road, but they said they'd basically wing it.
This wireless trial would seem to dodge that legislation by making them separate physical entities, even though they are operated together. Surely the simpler solution would be to legislate to permit road-trains instead on certain routes. Same saving on fuel and salaries.