Abstract: The trommel screen unit includes a screen panel of polyurethane having embedded therein a plurality of longitudinal and transverse fiberglass rods. Marginal portions of the polyurethane panel overlie and are bonded to a rectangular steel frame, the sides of the frame having longitudinally spaced notches which receive therein the end portions of the transverse rod.

Abstract: The crossover unit includes a polyurethane pad having a slot extending downwardly and then laterally or horizontally beneath an overhanging lip. A wedge-shaped rubber insert or plug is received in the slot which not only closes the slot, but also resists deflection of the lip when heavy vehicles traverse the unit so that sufficient space is maintained beneath the lip for the protective accommodation of an electric power cable or hose. In a second embodiment the slot extends in opposite lateral directions between a pair of overhanging lips, the insert in this instance being received between the two lips so that space exists under the lips for two cables or hoses.

Abstract: A pair of elongated anchors possessing a Z-shaped cross section each have one flange embedded in one side of an elastomeric block and its other flange welded to the metal surface of the truck box to be protected. The sides of each block are angled so as to form a converging slot between blocks. An elongated strip, also of elastomeric material and somewhat softer than that of the blocks, is pressed into each slot to create a generally flush relation with the blocks.