My 3500 HD was licensed at 12,000# with a commercial plate when I bought it. I changed to a non-commercial plate and 10,000#. I had my choice of 10,000, 12,000 or 15,000#. I went with 10,000 because some of the places I've been require me to weigh if over 10,000# I've never had a problem when towing even though I'm probably close to 12,000# when hitched up. Never been through a weigh station yet with my RV and won't be required to stop when not towing as it's plated for only 10,000#. The way I see it just leave it alone.
B.O.