Kids and Semis

OK Can someone please tell me if I can take my 2 kids legally in my semi truck, I am a owner opp will have my own insurance and the company that I will lease to will allow it, I understand car seat laws which I will use when in the front of the cab, One child is 18 mos and the other is 2 1/2 with 2 adults, I will drive at night which means kiddos will be in the sleeper with dad at night, but How do I stay legal If one kid is in the front seat (in a car seat) the other to be in the back with (mom or Dad) depending on the time of the day is it legal, Please some one help I have called OOIDA...No Help I don't want DOT making up the rules along the way if I get pulled into a check station Tried to look this up in handbook just says use car seat got that but I have 2 kids going one