The pin weight shown in the brochure is invariable the "dry" pin weight, i.e. what the pin weighs on the "dry" trailer weight. That means totally empty, just as it comes from the factory.
Your actual pin weight will be 20-25% of the actual loaded weight. There is some variability depending on how much the trailer is loaded, and where that weight is placed. More weight behind the axles lightens the pin, while more weight forward makes it heavier. The location of the water tanks and amount of water onboard is one key factor. Since most 5W storage is forward, modern 5W's trend toward the heavier side of the pin weight range.