Also some of them are paid very well. Any of your unionized specialty trades can easily make $150k+ a year, especially if they’re willing to travel or work a lot of OT. If you’re single or married with no kids, you can pretty easily afford a big fancy truck like that.
If you’re willing to travel that can be more than $50k a year in per diem pay, so in two years you can easily pay off a new trailer to live in and a nice truck to haul it with. I personally know people who have done exactly this. The catch is that you need to get into a good union and do your apprenticeship and generally have your shit together. It always surprises me that more people don’t know this.