It's not about what you can pull and get moving, it's about what you can control once you get it moving.
As someone said, be involved in an accident and even though someone else was the initial cause of the accident, a lot of responsibility could be transferred to the vehicle that was towing outside it's approved weight class. Of course all depends upon the circumstances, but everyone is usually looking to blame someone else or at lease spread the blame.
For example in NJ, a DUI involved in an accident that results in a death requires a mandatory jail sentence. True story, a guy who is under the influence, but driving ok, stops at the red traffic light. Someone apparently completely sober but distracted crashes into the rear of the first vehicle stopped at the red light. Second driver is killed in the accident. During the investigation it's determined the first driver, who so far had done nothing wrong to contribute to the accident, is under the influence. He is charged, first offense doing anything wrong in his life, and winds up in jail because the second driver died.
I'm not saying I never did anything illegal, just saying be careful out there because it's so easy for something that should not be a problem to become a big problem. No one ever gets up and says today is the day I'm going to do something to screw up the rest of my life, stuff just happens and we wish we had not done it that way today.