Hey Andrew take a look at the following thread, looks like some people are having issues with inner beads on some tire including the Pitbull's because of differences in the thickness of their bead. Popping inner beads at single digit tire pressures, kind of defeats the purpose of a beadlock. Looking good BTW.
Oops link http://www.pirate4x4.com/forum/showthread.php?t=962575