What I am worried about is if I set the ball height on the hitch with noting in the bed of the truck, then load the bed for travel and hook up the trailer I will actually be lifting the tongue weight and the bed weight on the WDH. That would seem like a lot of weight for the WDH to equalize out. Assuming 300 lbs or so of weight in the bed of the truck and around 400 lbs on the tongue.
I know I am probably over thinking this I just want to do what is correct and get it as close to perfect as possible.