It's my understanding that second division vehicles are anything that qualify for something other than a standard passenger vehicle plate. So basically, trucks, trailers, RVs .... ect. So by the technicallity of the law, alot of Jeep and SUV drivers are plated as primary vehicles and are probably breaking the law.

What you should be concerned with more than if your going to be pulled over, is that some insurance companies like to take advantage of the law and refuse to pay damages. Ecspeically if you monster truck some little car.