You have to admire him
2 chains side by side at the front and 2 spread evenly apart at the rear on the rear Container the front ones to hold the Container down the rear ones to hold the trailer up . Empty 20' GP containers weigh 2300 kgs add up the trailer tare weight plus the ute towing it would have to be close enough to 7 tonnes gross.
In my view this would be dangerous.
Making a small effort to save the history of road transport in Australia by being in front of Simms