I have never really heard of this being a common problem on the SD's, but my wife drives a Cherokee and I think they come from the factory with death wobble and get worse from there....
That being said, the MOST common thing on the Cherokee's is a bad track bar...although our's don't have the same type of joint on the end. A combination of relatively minor problems can all accumulate to create death wobble also. With the tires on the ground, start the truck and have someone wobble the steering back and forth just enough to barely moove the tires. Look/feel (CAREFULLY) at each joint on the steering linkage (tie rods, drag link, pitman arm) also check for excessive play in the track bar (should be no looseness in the steering linkage, but trackbar may flex some due to the rubber in the joint in the end.) Next jack up the front end and grab the tire at the top and bottom and try and rock it back and forth (push on the top and pull on the bottom and then switch back and forth) while doing this have someone look/feel the ball joints for any play, there shouldn't be any. Do the same thing side to side...if steering linkage was tight in previous check, any play should be from the wheel bearings, but you should also be able to feel wheel bearing while checking the ball joints. IF all of that is good, I would recommend checking the steering shaft, gearbox mount, cracks in frame around the steering gearbox, and if EVERYTHING is good, try a steering stabilizer. I would hate to see a stabilizer cover up a more serious problem. I have 37's and notice no difference on road with or without my steering stabilizer. (Off road is another story)
BTW, Knowing mods to your truck might help a bit with some diagnoses of problems. Track bar angles in relation to drag link angle can cause some weird problems with bump steer, wobble, etc. on lifted vehicles too.
Hope this wasn't too complicated, feel free to ask for clarification if it is. I have a hard time translating actions into words.