My Buddy is a cop not CHP, everything depends on their training and what they are looking for now. They have sooooo many laws they need to know that many do not even know the law you are breaking. A normal Traffic CHP may not care that you are over length but a commercial CHP could see you from a mile away. Most of the time they are looking for something different ie speeding, lane changes, lights out. Anything that will give them a reason to stop you. They don't want to waste time unless they can write you a ticket. Don't get me wrong you could find the right cop on the wrong day and he could stop you and impound you, so I guess it comes down to what you are willing to risk.