WOW Thanks for the information.. I too have a 3585RL I didn't get a flex extention in my Packet.. I did however have to replace all the mounting screws on the outside wall where the cables connect. One of the backets had all the screws shear off. After replacing the screws with bigger and longer ones, I had a fun time getting the cable back to the brackett... After that I removed all the other screws one at a time and replaced them. I do't know why they sheared off other than they were to small.. I did print of the manual posted here. I will contact my dealer for a flex extention to.. Sure wish they would have put hydraulic here too... Haven't had any problems with the 2 other slides [hydraulic]. As a matter of fact I haven't had any serious problems at all, and the small ones I have had I have been able to fix myself. Thankfull for being mechanical, as my family refers to me as the "tool man".
Hpe you have had as much enjoyment with your 3585 as we have, in such a short time Jan.2011.
Larry and Donna Keever
Oklahoma City, Ok.
2010 Ford F-350 FX4 6.4 diesel Dually
2011 BigHorn 3585RL
HOC1811
Looking forward to our first Heartland Rally in Canton,Tx. in October.