Disclosed is technology including a snub idler for a conveyor having a plurality of rollers and a frame comprising means to support the plurality of rollers in a convex or similar shape. The means to support the plurality of rollers in a convex shape may include a pair of convex arcuate or similar rails respectively affixed to a side panel of the frame. The present technology also includes a conveyor including a tail pulley, an impact load bed defining a trough and having a concave shape, and one or more snub idlers positioned between the tail pulley and the impact load bed. In this arrangement the snub idler supports a plurality of rollers having a convex or similar shape generally complementary with the concave shape of the impact load bed trough. The disclosed technology also includes a method of positioning and shaping a conveyor belt, including configuring a snub idler having a plurality of roller segments, with each roller segment having a roller, wherein the rollers define a convex or similar shape generally complementary with a concave shape of a trough defined by an impact load bed of a conveyor. This method further includes positioning the snub idler longitudinally between a tail pulley of the conveyor and the impact load bed, and supporting the snub idler with a snub idler support structure such that the roller of at least some of the roller segments of the snub idler is in contact with an upper surface of the conveyor belt and forces the conveyor belt down into the trough.