GVWR and Tongue Weight

jbrack wrote:
Does the tongue weight applied to the fifth wheel hitch reduce the weight of the loaded trailer? In other words, if my loaded trailer weights 12,000 lbs while not attached to my truck but when I hitch up there is 2,000 lbs of tongue weight, is my GVW of the trailer reduced by that 2,000 lbs making it now weigh 10,000 lbs?

Complicated ain't it? Thing is. You trailer axles never carried all the weight of the trailer. That is why they are normally rated for less than the GVWR. The pin weight is always either on the truck, or on the front supports. So if your trailer weighs 12000lb, but you have 2000lb of pin weight. You trailer tires always carry 10,000lb. even when not hooked to your truck.