I have a 2001 EB that was experiencing the same exact death wobble symptoms you describe. After going through various forum posts related to the issue, I narrowed it down to the rotors being warped. I also found the pad caliper guide pins needed grease. This might have lead to some of the warping. As mentioned in another comment, the steering stabilizer only masks the problem. I know because I had replaced mine and I thought it solved the problem but the wobble came right back.Rotors are t cheap, they customize their own to fit the Dana 60 I learned and are $155 a piece.
The Quigley replacement rotor cost was painful to find. A bit of research revealed that the rotors were simply machined a small amount so I decided to attack the job myself. I posted a writeup over in the Sportsmobile Forum describing the process and details:
Hi Folks - I've got a 2001 Sportsmobile with a Quigley conversion. It was time to replace the front rotors so I gave Sportsmobile a call which led to a call to Quigley to get the details. According to
Video of milling one of the rotors:
Note, I would have liked to use a lathe but didn't have access to one that could handle the size of the rotors. I'm also guessing that a local machine shop can do this far easier with a big lathe. The rotors require only a very small notch removed from the inside so they clear the ABS sensor.
With mine, I've had no problems and the braking has been fine. No wobble has returned.
Hope this helps.