Jb, the problem is, rarely are all those obligations to the owner/operator fullfilled. I can't see how "buying a tag that cover the total weight" magically strengthens the truck to be able to tow an infinite amount of weight.
I've seen many a bumper hitch rated for 12K being used for 16K. See way too many guys over 26,001 with an over 10,001 trailer without a Class A CDL. Seen far far too many trucks 5-10K past their truck manufacturer's max allowable GCWR, and on & on.
And my main question to all of them is who/what are you putting at risk by being in the 30-35K range in a truck engineered to be in the 20-26K range?
If this were done in my 4800, or another serious large truck, I'd be put out of service and severely fined. Why should a pickup truck operator be treated any different? In the eyes of the law, I would think they are illegal and putting the GP in danger.
jb, respectfully, I disagree. Truck GCWR's should not be exceeded.
You missed the point. It is not Illegal. Criminally stupid at worst and inadvisable at best, but not illegal when the tires, license, per axle load and tags are all in spec. Darn near, if not every 1 ton dually with a dual tandem axle trailer is over GCWR. No way you can put a 20k trailer behind a 7-8000 pound empty truck and stay within the 22k GCWR. But, they aren't automatically illegal.
Maybe you forgot that laws are written by politicians and logic does not apply...
jb