just read a bunch of posts saying 1/8 to 1/4 toe in. toe in doesn't work for me though. just my 
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I have always-ed "toe-in" never "toe-out" my vehicles, and I do not have Any death wobble, from my pro-street drag cars to my crawler... (FYI: I do not run a steering stabilizer on my crawler) That being said I always "toe in 1/16" to 1/8" depending on what vehicle it is. I would not recommend "toeing in" a 1/4" it might drive smooth at 1/4" but it will cause excessive tire wear/cupping...
I would also do a run through of your rig, check the steering box, make sure its tight, check the pitman arm on the sector shaft,(this will cause wobbles if loose) ,, check each of your TRE make sure they are not loose and or worn out,, steering arms, make sure they are torqed down,,, check your caster angle, should be anywhere from 5-7*,, make sure your wheel bearings are not loose or worn out, obviously you dont want any play in your shackles, make sure your lug nuts are tight and your tires are not falling off....
I have seen this happen, wasnt pretty.... Same thing if you run wheel spacers, throw a torq wrench on them as well, better to be safe then have your super swamper come off on the freeway doing 55
