Good for you, but I don't see the assumption that the "average" trucker doesn't have an electronics degree etc is insulting. It's not just truckers. A *lot* of people specialize and tend to get sunk into a particular career/education path.
Sure, some of them will be able to fall back onto some other skill. Some will be able to turn hobbies into great jobs. It happens, but not that frequently.
I was starting school as the lumber industry began to fall back in my home province. Some of those guys moved to an IT path and were great at it. I know another guy who became an electrician. Whatever the outliers, there were *lots* of people in my class (coming from the lumber industry) who had no place in IT. They simply couldn't grasp the concepts, or - when they did - there were struggling in the face of others who had more aptitude. So why choose IT? There were simply no more jobs in the industry they'd worked for 20+ years... or at least none that would pay the bills. Everyone was being told "IT is the future of jobs" so they ended up in my program. But frankly, people who'd been working in remote locations for half their lives or more simple didn't have enough exposure or grasp of technology for that industry. It ended up swamping classes with people who dropped out, or barely passed tests by studying 24/7 but who had no real aptitude for the work in a real-life situation.
If the human-driven transportation industry started to be replaced by automation, how many "truckers" would find themselves in dire straights? I'd guess it would be similar to the lumber industry. Some people would move to [industry that supposedly has jobs] but find themselves without an aptitude. Some would drop out, some would scrape through. Others would find a natural skill for something else and do OK. There would be lots though who would simply find themselves struggling to find relevance in the current job market, and go through hell for it.
It's not about being incapable of doing anything else. It's being capable of doing something else that pays the bills and has job opportunities available before you go bankrupt. When you've got a wife, kids, and mortgage, it's not easy to just pick up and move on. Education is expensive and takes time. Other skills may not necessarily equal any sort of immediate job opportunity. It's not that you're incapable, it's that the opportunities might not exist for the average person, especially when the markets would be saturated by your fellows also suddenly looking for work and have bills to pay.