Let's be clear about this. There is no law that says "you can't tow overweight". If you are involved in an accident you may be charged with negligence. But, if you are involved in an accident and they are so inclined, they "will" find a reason regardless. You could be charged with negligence for: failure to stop in a safe assured distance, failure to realize there might be a patch of ice on the road, failure to use your turn signal, improper lane usage, speeding, improper signal usage, driving to fast for the conditions, or any one of a thousand other possible charges. They key word in all the above responses is "negligence". They will find a reason.
Lacking an accident, you can never be pulled over, weighed and cited "non-commercial" unless you have over 20,000 lbs on an axle or exceed a tire rating.
