That's very thorough, I'm surprised they care so much. I understand why they (and our cops) keep an eye on the big trucks, if they are overweight they can damage the roads, with these smaller vehicles not so much.
The US seems to care very little about the safety its people as a whole, where here the government is pushed by the people into making sure everyone is safe on our roads- the random weighing was brought in a while ago because of the number of people killed and injured by crashes caused by overweight and poorly loaded caravans (both the people in them, and others involved in the crashes caused by them) hence the introduction of weighing inspections on holidays back in the early 2000's...
Very similar to the introduction of RBT's (random breath testing- blow in the bag at the time, now just count to ten into the RBT tester- you can be pulled over for a RBT at any time, anywhere, and there are often 'RBT test spots' where they pull over basically everyone for a test- its usually less than 30 seconds and you are back on your way, without ever having to get out of the car), the huge amount of the road toll caused by drink drivers back in the 1970's was a major factor in the public demanding that something be done about it (speed in the 1990's was another one, with the introduction of speed cameras at crash 'blackspots')
As a result, the road toll has dropped hugely- despite the number of cars travelling on Australian roads having skyrocketed since the 1970's from 4 million registered vehicles to over 20 million registered vehicles today, the road toll remains at a level even now, well under the road toll then in the number of actual deaths per annum... (from a peak in the 1970's of over 3000 deaths per annum, to today being less than half that at about 1160 in 2022!!!) 5 times as many vehicles on the road yet the number of deaths has halved... (the US has about 3 times the number of people killed per year compared to Australia per capita)
Moving would certainly be a pain. Here you just rent a big U-haul truck (which would exceed all your limits) gather a few friends and load up. It's really not hard to drive one. An 18 wheeler does require some training.
Yep, you most certainly would not be able to rent a truck of the size you can there- a 20ft 'boxtruck' ie a pantech here- is usually well into the MR (medium rigid) licence category here- and while people may be able to 'generally steer them' a car driver usually does NOT actually drive them well... they simply don't have the knowledge or training to do so...
A 'semi' (what the US calls an '18 wheeler'- here thats a '22 wheeler' lol as tri's (3 axles) are the norm on a semi trailers trailer) takes a LOT of training to drive well and safely- a bad driver can kill people very easily, which is why getting your HC licence (heavy combination) is a multi year process- you have to hold your car licence for at least 4 years in total one year of L plates (have to drive with a licenced car driver in the passengers seat), then two years on your P plates (restricted speed, no mobile phone use at all, power (engine size) limited, restricted number of passengers), then a full year on your 'blacks' (full unrestricted car licence) before you move into the 'rigid' trucks, which requires a professional driving training course and more driving experience on them before moving onto your 'combination' licence ie single trailer semi-trailers- and more driving time and training before getting your 'BDub' (2 trailers) or road train licence (3 or more trailers)- it might take up to five years before getting into the 'big trucks' 'combination' licence- once off your car licence, you have added responsibilities, and fines etc are higher as befits the standing of being a 'professional driver'- the average semi driver drives more in a year than the average car driver does in several decades, yet their accident rate is far lower per km- that added training shows up in the crash rates...
(and that is the reason that 'cowboy truckers' are very rare here- overloading, drink driving and speeding is very uncommon in the 'pro drivers' (and even in the car drivers), as doing so could see you lose that licence it took up to five years to get- and for the more serious levels of offences, you will often lose your 'truck licence' entirely meaning you have to start all over again from scratch!!)