Impossible to say because of the amount of variables. That may be hard to understand from the outside looking in, but this isn't a normal job in any way. You can count on at least 30k if you aren't furloughed your first year, probably more but 30k is a safe number. Could be 50-60k your first year, its anyones guess because its all dependent on where you are, how much you mark off, the amount of work available, whether you're a yard or road guy, etc. Variables everywhere. That being said, you can gross 120k if you're in a busy terminal and stay out on the road. That isn't the norm, but its been done and will continue to be done. I can't even give you an average take home pay, every terminal is different. What the average would be for my terminal for the road will differ from the yard, and both will differ from the next terminal. Not the answer you want, but that is about as cut and dry as it gets. Hope that helps crack the code a little bit.
Semper Fi