I just recieved my tank cover today. I've read and re-read this post several times and I still am not sure I get it. I see where the tabs go into the back of the cab, however, I don't see where the cover bends to go down the face of the tank. perhaps there should be a crease all the way across???. The only creases are a "V" shaped crease at each end. Should I use a straight edge and bend the cover straight across from the point of each of these "V"s?. Will this give me the bend I need to go down the face of the tank? Should the carpet go in before the cover or the cover first?