The PBC comes with a grill grate, and most likely that's how I would cook ribs and a packer on it. You could and I have hung a flat and a butt with no problem, but I pulled some butcher twine though them. Even at 275 your 325 at the center of the grate, I have no idea what temps your at just a couple inches above the basket, but I know what happens when your that close. We split our racks in half and hung them that way. Personally I like to wrap my ribs, brisket, and butts. So hanging just wasn't my preferred way to cook them, too much trouble. That being said, hanging split or whole chickens is the bomb, and you can hang a bunch of them. Even in a 18 1/2 inch cooker. I know a lot of comp teams that haul around a UDS for one thing, they are a great chicken cooker.
It's all about the Meat!