bbqbull,
I hang my ribs using the rib hooks that came with my CS55 and AmeriQue. In the CS55 I have hung seven full spare ribs. If they were a little too long I hooked the second or third rib from the end. In a couple of places the ribs touched the walls and each other, but it didn't make any effect on the finished product.
I believe we could have hung up to nine if we needed that much meat and a little overlap would still allow good smoking. I use six to seven ounces of wood (red bay) with ribs and smoke at 220 degrees. I paint the ribs with a honey slather as I remove them from the smoker. We do not use a thermometer with ribs, but check them after four hours. The ribs always turned out tinder and each rack had close to a 3/4 inch recession up the bone. I found a couple of short bones that fell out when removing the ribs from the smoker - a good sign.
I bought rib racks for the AmeriQue and they don't work for me - just like the hooks.
smokemullet