First make sure nothing is worn and everything is tight. Trac bar bushings every year or two is not ridiculous. Worn king pins (typically uppper bushing) or weak spring can cause it, wheel bearings, tie rod ends, tire balance, etc... Alignment as well. After everything else is 100% you probably won't have death wobble anymore. I still run a stabilizer but my truck won't DW without it... Though rarely at the right speed over the right type of bump or pothole it'll shimmy just a hair for a second like it wants to DW, but never gets set off. The stabilizer prevents even that. I consider it cheap insurance for a properly set up truck, but it is not a fix for a truck that wobbles if you give it a dirty look. The bigger the tire the easier it'll want to DW, but 36" shouldn't be setting it off real easy unless they're out of balance or you have other issues.