We got our 09 3600 RL Big Horn and noticed that a counter top extension would work , so we went through the dealer and ordered it. Usually prices are not allowed on this site, but if you private e-mail me I will give you the info. They do have to build the extension, but it worked fine. It was shipped with the appropriate hinges. I'm not sure what the end of the existing counter is like, the 3600 has a "squared off" counter. Our previous 3670 has a more "cutoff" on the corners of the counter - I don't think the extension would have worked well there. WFM (Worked for Me)