I just had a Line-X bed liner and hard cover installed with the Ram boxes and the utility group. I was a bit worried about the install, as was the Line-X guys since they haven't done one of those yet (utility group and ram boxes). However, the fitment was perfect. The cover slides into the top of the rails and secures with screws near the window (easy access to remove the whole thing). The ram boxes don't contact the cover when open (about an 1/8" clear). If you don't have the ram boxes, then the cover is slightly wider, but should fit the same way. I was actually impressed with how well the Line-X cover fit with the utility group. Super happy with the overall purchase.