I tow a triple-axle boat trailer that weighs 11,500 to 12,000 depending on how much fuel is aboard, using the factory hitch (replaced under the recall with a new one which also has the braces added). The original did start to develop some cracking.
Tongue weight was carefully adjusted to 900-950 by changing axle position, and the truck tows quite well. No weight distribution gear. Truck has camper group installed, and Rancho 9000's.
I watch the replaced one carefully, and after maybe 25K miles towing the boat on the replacement hitch there's no apparent problem. If it ever looks like it's even starting to fail I'll be replacing it with a heavier-duty one, but so far so good.