I need to smoke ~20 lbs of butt for pulled pork. My 18.5" WSM does great with one at a time, but in order to get this done in time, I need to try smoking two +/- 10lbs butts at once. I thought I would put one on the lower rack and the other on the top rack. However, I only have one meat probe. Is it safe to assume they will both cook ABOUT the same way and time? Has anyone ever done this before? Thanks for your help, in advance.