i think you try to confuse people. The trailer is the 16,800. And your truck should have a tow rating.
If you put 14 k on a 14 k trailer that has 2k TW added into the GVW then you are NOT over assuming the trailer weighs 2000 lbs or less. Most trailers that size weigh about 3000. My Cam has 7k axles and 2k TW added to the GVW so it has 16000 gvw. It weighs 2900 so I can put 13100 on it.