Sorry, but they already have these ideas.
If you get stopped, they can nail you for almost anything, such as EXCEEDING THE MANUFACTURERS WEIGHT CAPACITY. Since Ford has a published 11,200 GVWR and a GCVWR of 20k on my truck, then the DOT can and will write you a citation for exceeding it. They can write you a ticket for exceeding each GVWR that each manufacturer has set for either the truck or the trailer, or the Gross Combined Vehicle Weight Rating that is published by the towing vehicle manufacturer. They can also cite you for exceeding axle ratings, or tire ratings, or how about ball ratings or the hitch rating? Anything that is exceeded can be cited.
So, as an example...
Can I mount a gooseneck hitch in my Chevy 1500 pickup with a 7500 pound towing package and pull 14,000 gross trailer if the trailer is rated to haul 14000? If I balance the load on the trailer, and keep the hitch weight below the half ton trucks GVW, is it legal? (not smart, but is it legal?) Nope and for good reason!
This is a perfect example of why I tend to stay out of the CDL comments or toss in 2 cents and leave, because there are too many variables and too many assumptions by people who either go by their experience, their interpretation of a whole lot of laws that darn few understand, including the people who are attempting to enforce them.