west elm art Some of the best pickup bed coverings to hold out water are the one piece hinged covers. Covers such as the fiberglass models, or even the plastic undercover tonneau are definitely the best to help keep water off your cargo. They wrap outrageous rails and tailgate. They are a one piece design without any hinges inside center to permit water to seep in. The only problem, these covers use a draw back for many truck owners. Their use is limited. If you have some cargo to haul that's greater than the18 wheeler bed sides, you're pretty much at a complete loss. If you're able to get that taller cargo in, you should leave the cover open. This could result in injury to the expensive cover. The fiberglass models have become heavy and hard to get rid of if you'd like full access of the truck bed to the taller cargo. The undercover is made easy to remove quickly, however you still virtually desire a second person to help you eliminate it. You will also have to let it rest exactly where you take it off.