Hope this helps...
Here's my CAT scale ticket of my fully loaded Octane 222SL being pulled by my F150. First without and then with the trailer.
Notice that the trailer axles are at 7480lbs.
13600 - 5400 = 8200lb trailer and WDH weight (truck was weighed without the WDH)
I had 1500lbs of Harleys in the rear and full fresh water over the axles. In other words... you can move weight forward to put more of the trailer weight on the truck.
My trailer also has fiberglass outside walls so it may be a bit heavier than those with corrugated walls.