I assume you are using the roll-reroll technique for processing such large prints. If so, draining is really important to reduce the water weight in the print before drying. If you have a large enough flat surface to lay out the prints and squeegee them (truck windshield wipers), I would do that. If not, then let them drip loosely rolled up and in a vertical position for a while.
For drying, I would recommend (in order of preference) appropriately-sized screens or mesh (nylon, not metal!) in frames (you can get a screen shop to make them up, or do-it-yourself at most big-box hardware stores). Lay the prints flat or slightly tilted and face-up if you tone. For some reason, toning makes my prints susceptible to screen marks. With prints that size and the accompanying investment in time and expense, you just don't want to take that chance.
Next, you could use tightly stretched linen or cotton sheets of the appropriate size or, for that matter, any inert type of netting, even fairly coarse (a safety net might work just great, you don't need fine mesh, even a mesh with a six-inch opening would likely work fine). Again, lay the prints flat or slightly tilted and face up. The trick here would be to minimize the bowing.
Hanging prints by the corners would be my last choice, just because of the risk of tearing, distorting the paper and the ever-present risk of the print letting go from whatever clips you have holding them and ending up on the floor.
However, if you could come up with a system where you draped the prints over a curved surface or the like with both sides hanging down (maybe a large paper roll or the like), then that might work well. It would have no clips to deal with and the hanging surface of the print would be divided into less than half, meaning less chance of damage and no chance of the print falling to the ground. I would imaging that the curling could be a problem, though...
How are you planning on transporting/storing such large prints. If you roll them up, you are likely to get curl that will be difficult to deal with later. If flat, than you need some boxes on steroids! Maybe between sheets of masonite or the like to prevent damage...
Hope this helps some.