15k GVW, so you can figure somewhere between 3k and 3.75k lbs on the pin, as a rule of thumb (20-25%), at gross weight. Remember, this is ONLY the pin weight and doesn't account for anything over a 150 lb driver and full fuel. Any driver weight > 150 comes off the sticker payload, as does the hitch, passengers and "stuff" you want to carry in the truck. Personally, I'd say you're firmly in dually territory. IF you can find someone with the exact same FW that's actually scaled it, loaded, that's the only real way to see what the pin is.
Lyle