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Unfortunately, it doesn't change the GVWR, it only decreases the amount he can put in the truck before he hits the limit. My truck, for example, is a crewcab, and it weighs 7200 lbs. I can technically only put 2000 lbs into it before I hit the GVWR. Another truck that is a SuperCab would weigh less, but with the same rating, would be able to add more weight before hitting the GVWR.
Did I say that so it makes sense?
I hope that helps.
In reality, he might have a slightly higher GVWR since it's a dually, likely 10,000lbs. The driver's door jamb would have the actual GVWR.