WDH specs call out tongue and trailer weight.
The specs assume a 10% tongue weight. At 15% tongue weight, the trailer number would be lower.
The bars on the WDH are sized for the actual tongue weight, not the calculated trailer weight as a percentage.
If they specified at 15%, they would call out a lighter trailer weight, but in general the only difference between a given manufacturers different hitch part numbers is the bars, the rest of the hitch parts are identical. They can all take the same weights with the right bars for the actual tongue weight.
While I would not exceed the maximum trailer weight for a specific hitch, treat the listed trailer weight as a calculated value, and the tongue weight as the actual specification.
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Was (update coming soon):
TV: '01 Yukon XL 3/4 Ton 4WD 8.1L 3.73 prodigy
TT: Still renting
Last Rental: Thor 27' Front Kitchen w/Super Slide