I don't "Leave out" my cookers, but they get pulled in and cleaned once the cook is done and the kettles are cooled off. Prepped for the next cook... In this pic I hadn't installed the thermometers in the lids yet. I must say that made a HUGE difference for sure! I know the Jumbo Joe Premium doesn't get a ton of love being the bottom of the line for the 22" grills, but I am finding it to be a great little setup so far! I would like an original 22" with the ash sweeper though. That would be nicer....