The company I work for got pulled over yesterday by the Motor Carrier Division. Here is what the officer told us: If your truck weighs more than 5000lbs. (so probably any of you with a 3/4 ton truck or larger) and pulling a trailer for a profit-making venture will need to get that truck registered with a commercial plate (Elected Gross Vehicle Weight registration plate). You can look on the Michigan State Police's website under FAQ's and find it. He also told us the requirement for straping down equipment is if the equipment's center of gravity is 6 inches or higher above the side rails of the trailer it needs to be strapped down. Otherwise, it doesn't. He mentioned nothing about DOT numbers, special licensing (chauffeurs or CDL), or inspections, which I have read that some say you need those things.