I mounted mine right behind the drivers seat as close to the center arm rest when it is up. I just drape the mic over the seat when I use it. I have a regular cab though.
its too bad the forum is broken and the search function doesn't work. there's a lot of great pics scattered around in the 2nd gen section. if you've got the time, you can manually scroll back through about a million of them.
here's one thread that includes several pics. mine is mounted on the floorboard in front of the middle seat. BB-29 Bubba Bracket for the cobra29. i bolted it through the floorboard. http://www.dodgeforum.com/m_1268404/tm.htm
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01 1500 Reg Cab 4wd 5.2 auto 3.55 285/75/16 step bar tow hook hypertech 180 3923 trans cool/filter posi-lok powertrax noslip timbren brite-box pioneer head rockford amp/spkr new hughes plenum water pump timing chain oil pump rear seal hoses belt tune up