The GVWR is determined by using a sophisticated social media / internet forum protocol formula.
(FAWR + RAWR)* X = GVWR
Where X is the "Variable Internet Forum Coefficient" or VIFC.
The VIFC is randomly determined by former NASA technician who were responsible for black tank flush maintenance and winterizing the space shuttles. The former technicians live in Houston TX and enjoy RVing, Camping, Boondocking and LT vs ST tire debates.
The VIFC was developed for entertainment purposes only... to encourage lively intellectual debate among RV enthusiast.
However, the VIFC has sinced morphed into a "COW" (can of worms) that can be taken literally, casually or ignored completely solely dependent upon what size TV you can afford to own. :W