If you get real serious about this, email me and I'll give you the telephone number of a guy I know who did this. He'll be glad to tell you what was involved. I think his truck was damaged in a tornado and his garage roof fell in and damaged his truck roof. I know he went from a 3 window to a 5 window. He's a helpful kind of guy and I'm sure he would be glad to help. Let me know if I can help.