Will the real GVWR please stand up?

[HomeMadeSin]

The 67 C20 I picked up had a SS plate on the door jamb that indicates 7500lb GVWR:



The 1967 Chevy truck "sales" book that lists the standard and optional equipment indicates that 7,500 is "Rating on standard GVW plate". but also lists that the 3,000 lb rear springs is required to achieve it. Seems ass backwards to list a higher GVW as default but you can only achieve it with optional equipment. Seems safer and more prudent to list the more conservative GVW of 5,500 lb. I'm sure there is some twisted bureaucratic BS logic to it. Or Chevy was too lazy to switch GVW plates as required.

My glovebox sticker only lists the auxiliary rear springs as an option but the 500 lb not the 3,000 lb:



So given the dual 3,000 lb (each) aux springs nets you an additional 2,000 lb in GVW, do my 500 lb (each) aux springs net me an additional 665 lbs? Or maybe a nice round 500 lbs NET and hence the stickers on the side of the truck that indicate 6,000?



If that holds water, then my payload is about 1,750 lbs (6,000 minus the 4,248 lb curb weight), although I have no clue if the curb weight is dry or full tank of gas.

Thanks,
Z