I just did. Are your roof ribs spaced apart more than 14 inches? Mine do not have a 14 inch gap between ribs, so I'd have to cut one unless I went almost all the way to the back or just behind the front cab. The problem with those locations is there is a welded seam. I have no idea if cutting through the rib or the seam is favorable. (I don't know how to post photos yet to illustrate)