[EggsOnToast]

>You start by saying how a personal care assistant is rather unspecialized work and then go on to ruminate on the peculiarities of the job that most people wouldn't want to deal with.

Correct. Being willing to endure undesirable work isn't usually included in the definition of skilled labor unless that tenacity is accompanied by another requisite skill or certification. I'm not trying to argue that it isn't a socially valuable skill, just that given the bar for entry it isn't surprising the wage is that low.

>Why isn't trucking an unskilled job just with negative features (long hours alone, danger to health given the erratic hours) too?

Because you've skipped over the training and licensing required to legally operate as a truck driver. You need a Commercial Drivers License if nothing else and many states require the completion of specialized courses before awarding an applicant their CDL. That CDL represents a specialized skill-set without which a person simply won't be permitted to operate as a trucker. Physical endurance and mental tenacity are critical traits in this instance too but they're far from being enough to get you hired.

Edit: Something else I glossed over, but which seems relevant because this is predominantly a tech oriented forum is that the average Cost of Living in America is in line with the wage being paid to the Home Health Aide. It might not be enough for San Francisco or a coastal area, but it's enough in general to pay rent and save some money on the side for additional schooling or whatever purpose appeals.