For Michigan there are several groups that the chauffeur license covers from group A,B,C,N,H,P,F,R,S
Current jobs I'm looking into require the chauffeur group
Group H licenses authorize holders to drive a commercial motor vehicle carrying hazardous materials.
Group A licenses authorize holders to drive a vehicle with a GVWR of 26,001 pounds or over, provided the GVWR of any towed vehicles is 10,001 pounds or more.
Group N licenses authorize holders to drive a tank vehicle.
Group R licenses authorize holders to drive a pick-up truck equipped with a fifth-wheel assembly with an attached semitrailer designed for recreational living purposes or towing an additional trailer.