"If you really want to go into the weeds you would need to examine the rest of the vehicle. Is the braking system the same? Or are the 3500 series brakes heavier? I honestly don't know, and don't care, because I have always assumed that the engineers designing something and a manufacturing a piece of equipment that are willing to put a warranty on it, have a better idea of what it can do than the average guy with a toolbox and a JCWhitney catalog. "
Don't know and don't care is why the mfgs recommendations exist in the first place probably.
But for those that do know and understand (don't have to care), incorrect assumptions from folks that don't know are false information.