Just pointing out a few things with that plan that you typed up...
total hours: 8x24 =192
Hours driving: 70
Hours not driving: 122
Hours per day of sleep: 8
Total sleeping hours: 8x8 = 64
Total hours left: 58
R&R hours per day: 7.25 hours/day
Even people that have homes, families, and other obligations have to use their time wisely for laundry, eating, etc. Lets look at a teacher
Total hours 7x24= 168
Total hours at work: (assuming 7:30-5) 47.5
Sleeping hours: 8x7 =56
Additional work hours: 1.5x7 (Lesson plan and compliance) = 10.5+
Total hoursleft: 54
R&R hours: 7.7 hours/day-
You can probably take almost any full time job and average it all out to about 7.5 hours per day of R&R. Unlike truck drivers, teachers also have summers and other holidays off - but a lot of that period is spent planning and going to meetings and seminars and even on furthering their own educations to get better pay. Pay.... hmm, speaking of pay, don't truck drivers get paid more than the average teacher?