I don't think it was mentioned above, but you'll want to set the kettle up for an indirect cook, not for grilling, and I'm not sure if there will be room for two briskets. You may be able to rig up some way to stand them up on on edge to give you more room and then rotate them part way through the cook.
There is a good diagram or picture around here that shows setting up a kettle for an indirect cook. Let me see if I can find it. BRB
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Our resident kettle smoking expert (at least that's what he calls himself
) shows various set up for smoking on a weber kettle.
"Ron Rico, Boss. You can call me Captain Ron..."
The Naked Fatty!
FEC-100/BWS Party/Memphis Pro SS/PBC/LBGE X 2/SBGE/Mini BGE/Nomad Pellet-matic/Good-One Model 42/WSM X 2/Cookshack Smokette 008/Weber Performer/Saber Cast 500/Weber Gasser (RIP)/Weber Kettle X 2/Weber Smokey Joe/WGA/UDS/Coffee Roasting Gasser and a pickle
Remembering a friend