I think Curt Manufacturing must have changed the specs in recent years, because their website says the 15400 has a 17,000 lb rating and a 2" receiver.
http://www.curtmfg.com/part/15400 (Edited to say: Or you can Google 'Curt 15400' and click on the first curtmfg.com link)
Those are close enough to the same specs as the Draw-Tite (16,000 lb rating) I bought. I was also eyeing the Curt 15800 which was only fifty bucks more, and has a 20,000 lb rating with 2.5" receiver.
I went with the Draw-Tite because I wanted to be able to remove the horizontal cross-member, but leave the mounting plates in place.
I don't plan on doing any heavy hauling with mine. The most I will drag around is 5,000 lbs of scout trailer loaded with gear. The "extra" capacity simply means that I won't ever worry about something getting stressed and breaking.