I am going camping with a group of friends over the long weekend, and have been designated camp cook. The big smoke will be Saturday, when I do a couple of butts, Dutch's beans, and cheesy potatoes. I can't remember the formula for how much I need to feed a group. The group will consist of 12 adults (including a couple of big eaters) and 6 kids. At the moment I have 2 butts that are 7-8 lbs each. Will that be enough?