Just a few thoughts on the subject, coming from my perspective as a prosecutor and attorney:
1. I've prosecuted traffic court cases for some time now. I've never seen an officer write a citation for being over GVWR, Mfr recommended axle weights, tire ratings, spring ratings, GCWR, etc. As long as you're not over on your license plates for the truck and trailer, and as long as you're not over on your legal axle limits (what the state says you can carry per axle, given your license plates, driver's license, the bridge law, etc.), you're not likely to get a ticket for being over on the technical, manufacturer recommended tow rating for your vehicle. Now...if you're obscenely overloaded (bumper scraping the ground), or if you are otherwise stupid or anger an officer (speed, cut someone off, no trailer lights, etc.), you're on your own. I once saw an individual get a ticket for having a windshield that wasn't DOT approved because he really PO'd an officer. That said, were I towing the above load with a Tundra, I wouldn't be too worried about getting a ticket for exceeding my GAWR or GCWR, provided that I was under my license plate weight limits, not on a no-load bridge, and not driving unduly through residential or non-truck areas.
2. I'm always amazed by the number of people who say things like: a) drive overloaded and your insurance won't cover you if you get in an accident; or, b) drive overloaded and you'll get sued and lose if you get in an accident. Now...to be clear..."overloaded" has a lot of meanings. Pull 80K with a Tundra, and you get what you deserve. However, a technical violation of the manufacturer's recommendations is not cause for termination of insurance or for too big of a fear of litigation. Insurance exists to cover you when you're in an accident. By definition, in the vast majority of accidents, someone is at fault, or 'negligent'. Their negligence can be in a variety of forms...not being observant, speeding, running a light, or driving an overweight vehicle. But the insurer CANNOT refuse to cover you because you were negligent...that is the purpose of insurance...to cover accidents where you're negligent. And I've never seen or heard of a verifiable single case where an insurer dropped someone for being overweight. Good luck to the insurer that makes that argument. As for the contention that being overweight is an "intentional act" which negates insurance coverage...it is as intentional as speeding...neither allows your insurer to write you off when you get in an accident. Similarly, for situations where you get in an accident and get sued, the question is still whether or not you were negligent, and whether or not the other person was negligent. Being overweight may make you a bit more negligent than you otherwise would be, but it's not a noose around your neck.
So for those who have posted the scary, scary threats about losing insurance, being sued, or getting tickets for exceeding GAWR, I'd challenge you to bring forth verifiable proof of this occurring, absent either: a) an insane, stupidly overweight load; b) a rude driver that offended a police officer; or, c) evidence compelling a determination that an actual accident involving an overweight vehicle was the result of intentional misconduct by the driver, and not mere negligence (and on that last one...many times, auto insurance has to cover intentional acts as well).