i actually have a hannibal double carrier sitting in my garage. I had plans for it but it looks like i am going to go with a different approach (actually focus on an aux tank instead) as i have too much weight on the roof already. I'll know for sure in a few weeks.
If you are still looking for one at the end of february drop me a pm.
Pete
Wow, HannibalUSA is discontininuing, or the parent company in S. Africa? Their Hannibalusa.com website now points to http://www.hannibal.co.za/, so perhaps not gone altogether? They have new product announcments and so forth on their S.A. website.
Anyway, might try the FrontRunner accessories from Equipt.com. I have found their accesseries to fit the slide rails in my Hannibal rack for the LR3.