everybody that's ever crashed....and or killed someone ELSE has previously said "it's fine, i do it all the time without problems".....or....."go slow, you'll be fine"..........until the day it DIDN"T go fine.........hell, nobody WANTS to slip and fall in the bathtub and break their neck. killing someone by accident is bad enough, killing someone by accident when your doing something outside the legal limits is reckless.
the real deal is you're are NOT getting around the liability and accountability in the advent of an incident, should you exceed the FACTORY ratings on the VIN......the law doesn't give a **** how much you beef up up a rig.
commercial vehicles can get overweight permits for certain applications, with insurance for it......unless by some miracle you can get the STICKER to say different or a vehicle re-rated(which i've never personally seen), you're liable in an accident.....and open to fines and or prosecution.
i've seen way too many severely injured and dead VICTIMS in my time....because fu@kin idiots were towing with vehicles that were not rated for the job......i'm not saying that's the case here, but it damned well could be.
it's almost like deer hunting with a .223 when there's a nice .270 Winchester available. smart people don't go deer hunting with 223's on PURPOSE......that's not even a good analogy, but someone may get they idea if the bell didn't ring before.
people will do what they choose, towing veterans have experience and intuitively know what they and their rig can do......and then there's other people that don't understand how fu@kin stupid they actually are.......either way, it doesn't absolve anyone of culpability should something go awry.