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That's because they are expecting 20% of that 15000# to be the pin weight and supported by the truck. Your pin weight will be right around 3000# Your axles will have 12000# on them. As with any 5th wheel you should have 20% of the gross on the pin for the tv and trailer to have the best handling.
Most of the manufactures do cheap it out and install tires and axles that are just a little more than needed. If you use your trailer a lot, you might look into upgrading your suspension.
And btw the dry weights and hitch weights they list for your trailer are actually a weight taken on the manufacturing floor with no gas bottles, batteries, spare tire, accessories of any sort....so those weights should NEVER be used in figuring out anything. The best thing everyone should do is to drive on the CAT scale at a truck stop and get an actual weight. It only cost $10. Well worth it to know exactly how much you weigh on both tv axles and trailer axles. Until you can weigh it always use the gross weight and 20% for the pin to get a rough estimate.
Hope this helps.
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