a second division vehicle is one that is for hire,carries over 8 passengers or is designed for these purposes,tow truck,dump truck ect cdl is a designation for drivers lic.Usally any plate greater than a "b" truck plate and any vehicle that is required to get a saftey sticker is a second division vehicle.by the way if the whole interior is passenger ,even though it says multipurpose on the title,it is still considered a passenger vehicle and does not require truck plates.B- truck plates just designate that the vehicle weight class is 8000 lbs or less.