Help with hitch decision

So I called Hensley and got the scoop. They recommended buying a Pull Rite ISR Super Rail. Once that is installed on the truck, you just drop the BD3 in and you're done. Even if GMC had the rail system available from the factory (which it won't be until next year), I'd need an adapter from Hensley to make it work. Rather than getting three pieces of hardware to make this work, I'm just going to get the Super Rail system and the BD3 hitch. Not cheap by any means but we don't want to do this twice and I want the ride to be as good as we can get for my wife. If the chucking is annoying, I'll add the MorRyde to the pin box later.

Thank you all for the great replies. I appreciate your help!