well you have a few days to experiment
try the minion method with an empty cooker. Or put a few bricks in it to similuate a load of meat. See how it does. all you have to lose is some charcoal.
that what I would do
Ok Joe Offset, New Braunfels El Dorado, Weber OTS 22.5 & 18.5, (2) Master Forge Charcoal, Auber ATC, charcoal retort Weber drum rotisserie