What makes up a GVWR rating?

uzikaduzi wrote:
I'm assuming these are state specific laws

There not regulations or size and weight codes but more info type sheets I mentioned above. This one also has been posted before.

The informational sheet from CA is much like the ones from BC and NHTSA.

I'll repost this email (in part)from a CA CVEO commander on the GVWR subject. The email is a question asked by a RV.net member;

"This is in response to your electronic mail dated October 14, 2009.
First, allow me to apologize for the untimely response to your e-mail.
My staff recently received your request and by the date of your e-mail,
it appears to have been lost in the system. You were requesting
information pertaining to state laws limiting the gross vehicle weight
rating (GVWR) and/or gross combined weight rating (GCWR) for fifth wheel and recreational vehicle owners. I have answered each of your questions
in the order asked.

Q: “Many of the owners travel over their tow vehicle GVWR and /or
GCWR. Are there any state laws against this? Or does the owner just
take the risk if they wish?”
A: The California Vehicle Code (CVC) does not contain a law that
specifically limits the amount of weight a vehicle may tow based on the towing vehicle GVWR or GCWR. There are, however, laws that limit the amount a vehicle may tow based on other criteria.

Section 1085(d) of Title 13 California Code of Regulations prohibits
the loading of tires above the maximum load rating marked on the tire,
or if unmarked the maximum load rating as specified in the applicable
Federal Motor Vehicle Safety Standard, or in a publication furnished to the public by the tire manufacturer. This would most likely happen in the case of a pickup truck towing a large fifth wheel travel trailer, as those types of trailers tend to transfer a larger portion of their weight to the last axle of the towing unit causing that axle to exceed the tire load limits.
I trust this has adequately answered your questions. Should you desire
any further information, please contact Officer Ron Leimer, of my staff,
at (916) 445-1865.
Sincerely,

S. B. DOWLING, Captain
Commander
Commercial Vehicle Section"

AS the California CVEO commander says its the vehicles axles and tires. GVWR simply isn't used as a vehicles max load.