Not looking to start a pissing match about who has more experience. I had a CDL for 10 years and ran a bus company for that long as well. We are both qualified to answer, unfortunately there are many different answers.
The weight listed on my title isnt the gvwr. It is the weight of my bus from when I had it retitled to motorhome and it is not labeled GVWR. It is labeled CWT i think. Ill look it up at home.
AFAIK, the GVWR is a rating from the mfgr based on the vehicles specs and equipment and is unchangeable by definition.
I apologize for bad info. Though everything I said is true in CO. Next time, lll stay out of it unless they're in my state