This is all good information.
Is it safe to say his pin weight will increase by 100lbs for every 400lbs of cargo they add? Using the 25% rule of thumb. I don't know how else to calculate loaded pin weight. Full waste tanks push me way over GVWR and RAWR on my 150 and my dry pin weight is 1150lbs.
He will never reach RAWR or CGVWR. It's how much over GVWR would be acceptable.
We live and travel in Texas and do not know what the law is here.
I don't want to see them make a costly error on this and he doesn't want to damage his new truck.