I know it has been said these vehicles can handle more GVWR than the sticker. The main reason for this sticker is to keep costs down on fees to states and the fed. Plus I'm sure a few more things. Can the trucks handle more, sure. The sticker becomes arbitrary. To do it "legally" you would need to change the classification of truck. Along with always needing to stop at truck inspection scales along the highways.
A driver does would not need a CDL to operate vehicles in Class 1 through Class 6, but each one with a GVWR over 10,001 pounds has to be identified with the name of the company and the USDT number. Do as you may. My ram 2500 can haul a lot more than the sticker. Yet, I don't want to change the classification.