Abstract: A load retaining cover is attachable to existing opened top silage trucks. The cover includes a lightweight supporting frame having a hinged cover formed of a frame covered by fine gauge wire mesh attached thereto. The cover is mounted to the support frame along a hinge axis extending parallel to a side wall of the truck cargo bed whereby access is from the side. The hinged cover section includes means connected to and operated by the truck electrical system for raising and lowering that section to open the cargo bed for deposit of silage therein.