I have a bull rack system (BR5 - the big one) for my GMG Jim Bowie. Its great for large batches of jerky. Its a little pain to clean when the small holes start to clog, but a little wire brushing and hose pipe / soap will do the trick. You do have to rotate the trays often if they are full. The bottom & top tray see more heat than the middle ones. I highly recommend the wire rack inserts also if you are doing jerky.
Brannon