Re: what's wrong with the Australian road train setup?
"Surely the simpler solution would be to legislate to permit road-trains instead on certain routes."
But to do that would require the (re-)construction of a network of terminals where the "trains" arrive and depart and smaller lorries can then take the loads into the towns and cities. Maybe call them "Freightliner Terminals" or something. And since we're going to all this trouble to build special terminals at special locations, we could maybe include a rail line into the terminal so actual trains on rails could take part in this new fangled freight network.