just a heads up for the all tandem fun, in case you havent seen it yet,
http://www.offroadchat.com/index.php? has alot of info on tandem axle conversions and their company site
www.usa6x6.com which seems to be not working at the moment. hopefully you can see the 'gear over box' they use, which is simply a transfer case mounted on the front of the middle axle.
btw, awesome project, i love tandems!
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If I have to explain, you wouldn't understand.
'74 Chevy C-30 350/4 speed/dually
'94 Ford Ranger