I'm a little confused about what the actual load capacity of my truck is(ie: weight in the bed). My rear axle code is 19, so according to my owner's manual, the truck has a GAWR of 3800lbs. There is no way that the truck on it's own(unladen) is taking up 2800lbs of rear axle capacity, even with 2 full fuel tanks. Something isn't adding up here.

The reason I ask is that I have a load to haul 400 miles that weighs somewhere between 1200 and 1400 lbs, and I want to make sure that the truck can handle it safely.