If you are housing them singly 15qt tubs are perfect for adults, many people a trio or so in the 28-32qt tubs and I think the 1.6-8 groups in the 41qts. All you'd have to do with the rack is add some belly heat for the hot spot and it should be good to go for some adult groups. That should be as easy as using aluminum tape to secure down the flexwatt.
This is a really long video, but I thought it was worth my time (better grab some popcorn):
http://www.youtube.com/watch?v=rbVR1...eature=related
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