I would do some research on the Rollbak. That was the cover I wanted originally, but not a single person I talked to in the industry knew what I was talking about. Then I started to look at Roll-N-Lock. It is similar to the Rollbak in that is it made of aluminum slats, but it also has a layer of vinyl covering the slats. For that reason I was hesitant to go with the Roll-N-Lock. After see many covers up close and personal, I didn't have any problems dropping the beans for the Roll-N-Lock. It is a great product and has served me well for the limited time I have had it. Something else to think about is that since Roll-N-Lock has many more dealers, getting warranty work won't be hard at all and their customer service is top notch.