I couldnt find anything related to either of my dads careers either.
However, in that time frame I imagine I would have done exactly what my grandfather would have done. Pretty much everything. He delivered furniture and coal, painted homes for a long time, wrestled as the "masked avenger" (I am NOT making that up, I have photos), and when the family was really low on cash, he participated in what in those days amounted to the "tough man" competition. Go down to the bar and see if anyone wanted to fight for money, everyone throws a few bucks in and the last man standing heads home with the 'pot'.
A bit of a different world these days.