This is from Ford on a GVW rectification, if you need to know more here is the web site I got he info from.
Re-rating GVWR: Why and How it's Done - Article - Work Truck
Beattie and Chew noted their greatest involvement comes with vehicles rated at 10,000 lbs. and under. With heavy and medium trucks, VSOs are now set up to accommodate the special GVW ratings. One requirement for vehicles over 10,000 GVW is that the drivers maintain comprehensive logbooks.
So, according to Chew, "The customer might say 'I'm willing to give up the payload capacity. I really don't need it. I want you to de-rate the vehicle. I'm happy to have all the components that allow me to have that much capacity, but I want a vehicle that's rated at 10,000 lbs. or less, so I can avoid maintaining logbooks and some of the other markings that must be on the vehicle.' "
He added the logbook and vehicle marking issues are the main reasons, over the past few years, the VSO group has been asked to do a 10,000 lb. de-rate from a higher GVWR — either 11,500 or 10,700 lbs.
Canada mandates a similar requirement as well, based on a GVWR of 4.5 metric tonnes (9,900 lbs.)
Chew noted that in the latest model-year, he and Beattie have taken many such special requests and incorporated them into the regular ordering guide. Those special GVWRs can be ordered from Ford without going through VSO. A 10,000-lb. GVW rating, for example, is available in both Super Duty and Econoline products.
Econoline products concern the shuttlebus industry. "For one fleet customer, we have de-rated an 11,500 lb. GVWR vehicle down to 9,900 lb. GVWR. The reasons are similar in Canada and the U.S., except it is a 9,900 lb. GVW rating that doesn't normally exist on a Ford cutaway today," Chew said.
According to Chew, a recent request came from a customer who wanted to take a 9,600-lb. single-rear-wheel cutaway, and up-rate it to 10,050 lbs. Another such request came from a shuttlebus customer who wanted to move from a Class 2 to Class 3 vehicle. Both requests appear based on the fact that in some cases standards may be less stringent.