For a start, I seem to recall that "unskilled" labour roles - ie jobs that do not require specific training and/or for which training can be received on the job or as part of the job - where the roles are traditionally held by men are better paid. Truck driver, garbage collector vs cleaner for example.
I agree in principle although trucking is distinct from the other two examples in that you can't be trained on the job. You need to obtain the licence first. Granted, you can obtain a HGV licence with a few days training but once you get into the construction side they're generally looking for two years driving experience. When you're talking about working on live motorway lanes etc they usually want to see at least two years in that specific area.
For my current role I needed a MPQC (Mineral Products Qualifications Council) card, a FORS (Fleet Operator Recognition Scheme) Silver level qualification, and to have undertaken various courses from Balfour Beatty Vinci, Tarmac, and also others like the Safe Urban Driving course. And to operate a concrete mixer there's a lot more stuff - it's typically less than 50% driving.
You need to understand the different mixes and applications (S1-S5, Easyflow, etc) and how to slump the mixes (consistency) to account for cold or hot temperatures - you only get one shot as you can't unwet the mix once slumped. And also need a good understanding of things like ad mixtures (e.g. retarder) steel/plastic fibres and the many different methods of delivery from concrete pumps, to interacting with tower cranes/slingers, and flooring/foundation pours where there are a lot of hand signals you need to be able to understand and react to within seconds in order to not discharge too much and manoeuvre with precision, often in poor lighting.
And then you need to know a plethora of other general site stuff like being able to quickly read the colour coding of traffic cones whilst driving (e.g. a blue/white one indicating overhead cabling, green/white indicating works access etc) and know the exclusion zones for different hazards etc. Mixers are top heavy and really easy to topple over, especially due to often working on uneven ground, which is why most fatalities happen with mixers and tippers. You need to be very proficient at driving off road and using the diff lock as if you get stuck the mix will often solidify in the drum before you can be recovered. None of it is that hard to understand but it's a lot to put together, especially when you're often working under pressure in extremely dangerous environments where it literally takes a second to mess up catastrophically.
It certainly didn't take as long to do all the training as it did to get my degree, but you're looking at a few years to become really competent and put it all together. It's a far cry from being a cleaner or binman tbf or a standard delivery driver dropping off pallets, without any disrespect to any of the above. You defo need to be pretty on the ball.
I was trying to get into Tarmac's in house concrete division for a good while and only succeeded after having contracted for Cemex, Aggregate Industries, Hanson/Heidelberg, Accumix, and Tarmac's mortar division - seven years trucking experience with three years specifically on the drum mixers.