bighog01 wrote:
Instead of saying "law", what I meant was that I assumed the payload sticker was like a certification from the manufacturer on what it's product could safely carry.
That is not entirely true in every case either depending on the class of vehicle. The truck classification system that dictates maximum GVWR for each class, which has been around for decades, is a bit out dated and needs to be updated. Regardless, this forces manufacturers to limit some trucks GVWR and payload to the max weight of the class it is in rather than what it can actually safely carry.
The 2B class that most 250/2500 trucks are in is an example of this. Since class 2b has a max GVWR of 10,000 lbs, all 250/2500 trucks are limited to a max GVWR of 10,000 lbs regardless of what they can safely carry. Class 3 trucks are limited to 14,000 lbs due to the DRW trucks which gives a lot of room for GVWR in the SRW 350/3500 trucks. Another example is class 4 which is where most 450/4500 trucks are in. Even they are mostly identical to the 550/5500 trucks, the 450/4500 trucks are maxed because of the max GVWR of class 4.