I found this hose that looks like it will work http://www.campingworld.com/shopping/item/5-propane-appliance-extension-hose-assembly/30331
Here is a pic from the manual.

I used to work on hydraulic equipment 30 years aga but I don't know if propane hoses and connecitons are different. Has anyone extened their Camp Chef hose? If so where did you buy the extension. Any help would be appreciated.