Think about it the trucks had nothing on the drive probably less than 4 tonnes total. Had they put 4 or 5 tonnes the car would have come apart after a couple of goes.
We work in a part of the transport industry where traction is our most important consideration it is never horsepower. Recently we sold some parts for a 15 inch axle to a guy who moves cars out of Port Kembla with a single drive with a single axle trailer 3 cars per load. He remarked that we leave the Port during the night similar time to when he loads up and heads off he said that if he left more than 5 minutes after us he never caught the load. Because of traction we use 2 trucks total weight 180 tonnes therefore we have too much power for what could be considered reasonable but 1 truck would spinnthe drive tyres and is far too much a risk.
Put a bit of weight on the Mack's and it would have been much quicker and far less entainering
Making a small effort to save the history of road transport in Australia by being in front of Simms
I haven't personally seen a chain break and injure a person.
BUT I was a Board director of a business that got a very heavy workcover fine (or whatever they were called back then) when a chain broke, and then broke some bones of the supervising engineer - who was in fact the most experienced and qualified person in the organisation in that field of work! But it was the organisation's fault of course - lack of job assessment and supervision.