I have searched the web and have found alot of stuff about the death wobble. There is never just one (or two) possibilities. Basically, like you guys have said, it could be any component of the suspension. I'll start with the easiest/cheapest things and work my way from there. As long as it doesn't get worse, I should be fine. I'll cut back on interstate travel a little.
I'll let you know what I find.
Thanks,
Chris