Decided to make a couple of longer rib racks. 12" long & 3" high, 1 1/2" spacing. I made each rack so it would hold 3 racks. That's what comes in a pack from Sams.
I already have some Charcoal Companion rib racks. They are too short. The ribs would just curl around in a U-shape, over lapping & touching each other.
I like to use the racks on the UDS when there is not enough room to lay them all flat. This weekend, I'll be cooking two 10 pound pork butts on the bottom rack and 6 racks of baby backs on the top rack.