someone above mentioned the blackburn TRX1 rack... I just installed one on my Disc trucker... @ under $30 it's a great buy IMHO... but we'll see how it does once I get to ride it loaded
the heavy triangulation and thick tubing should keep it from swaying and keep the luggage where it belongs
the only real issue that I ran into was the chainstay mounting hardware options... I had to use the center mount strip thing that connects to the brake bridge and even that was barely short enough to get the rack flat... had I used the nice tubular rod that connects to the seat stay rack mounts it pushed the racuk would be WAY further back and at a silly angle
*ignore the front rack setup... it's not going to work on this bike it seems... but for $8 it was worth the gamble*