Just to reinforce what others have said... I also use bus tubs for prep. Process: Trim quickly (no more than a few seconds per butt), rub, then either store in the refrigerator/cooler or they go directly to smoker. If you have a couple people doing this you can prep a LOT of butts while the pit is coming up to temp. Unassisted mine takes a little over an hour to get to 275F. Enlisting help for pulling & serving is usually not an issue for charity cooks. YMMV... Cheers!!!
If Homebrew & BBQ aren't the answer, then you're askin' the wrong questions... Cheers!!!