I'm trying to decide what kind of tonneau cover to get for my Ram. I previously had a SnugLid (fiberglass), but my fairly constant need to haul materials made it a pain in the rear to load. I was thinking of a folding or sliding type, but would like it to be fairly water-tight. I also need to consider how the unit installs so I can decide whether I go over or under the rail with Line-X. Would the Pace-Edwards unit be a good choice? If not, any other recommedations would be greatly appreciated. Thanks.