Good ideas. I was hoping to be able to make the adjustment while the food was cooking. So I probably won't have access to put my hands inside the drum. Some type of crank mechanism is what I had in my mind, just can't figure out how to do it.
I believe it is SmokerKing that uses shelving posts like you would get from lowes for a closet. You have to burn the paint off but then you just mount three of them in the barrel and you can adjust the racks to any height you want.