Just curious which rack positioning you all use in a vertical smoker. I have a Brinkmann two door model that has four possible positions - from lowest to highest. It only came with two racks and I have used several different positions but don't really know if I prefer one setting over the other. So far so good but I'd like to learn from others experience as to what has been gained or lost from using the different settings if anything. Here is a pic of what's cooking this morning - you can see the slots for the possible rack positions: Your thoughts? Also - has anyone found an easy, cost effective way to add racks?