Oops, I forgot to mention I have air bags too and they do not add to the GVWR. They just level the load and for me improved the ride tremendously. They also bring the headlamps down a bit so you don't blind opposing traffic. When you think about it (and this helps hide overweight rigs in Canada) the air bags also help disguise the fact you might be overloaded.
Like Phil (exav8tr) suggests, good luck getting recertified by the dealer. In California, there are commercial companies that do this service for a large fee and processing (this is what I understand - I didn't even bother trying). This is actually quite a business since trucks are being rebuilt from shells and will need a new pillar label when the work is completed. I stopped at getting the name of a company in L.A. and their phone number. I no longer have this info.
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