No, I'm saying no such thing. If the truck has a GVWR of 10k and the trailer's is 12k, and the truck has no GCWR on its door sticker (or if it's greater than the sum of the individual units' GVWRs), then the legal GCWR of that combination is 10k+12k=22k. Provided that none of the axle and tire ratings are exceeded that is the maximum legal gross weight of the combination. In such a combination, the truck could have 5k on the front axle, 7k on the rear axle, and the remaining 10k on the trailer axles and be totally legal even though the sum of the truck's axle weights is 12k, which exceeds its GVWR of 10k.No, sorry.
Pin weight is just that, it gets distributed to the rear axle of the truck, Therefore the higher rear axle rating, don’t forget your hitch weight is your payload rating.
There is no different than putting 3500lbs block in the back of the box, or putting a hitch in there and pinning up to something.
DOT will use the GVW of the trailer and the GVW of the truck, all of that is measured at the axles for your combined Your combined GVWR. The ratings on the tags are what the officer is going to look at, commercial vehicles they will look at your licenced GVWR, with you see on a sticker on the cab of the truck, which you can set at whatever suits your needs for combination. You cannot go over the licensed commercial vehicles GVWR, same as the GVWR of the truck and the trailer.
The beauty thing about a bumper pull, I can transfer weight off the rear axle to the front axle, I can also do that with the trailer axles as well, all with adjusting the hitch.
Using your example the truck has a GVWR of 10000lbs and a travel trailer has a GVWR of 12000lbs, your saying you can roll on a scale and be 25000lbs combined and be legal weight?
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However, for a single unit scenario, those truck axle weights would put it over its GVWR and hence the truck could not be operated legally.