The real question is, though, why don't the women get/take such jobs. I think the answer is a mixture of the following: (1) they are worse at such jobs than men (physically weaker and menstruating, which I assume might matter for a job like truck-driving), (2) (I assume) women get more government help, because they are more often (single) mothers and (3) women can play on other qualities (more social, better caregivers, more attractive, less dangerous) that allows them to get other jobs (nanny, waitress, secretary, ...).