exemplary embodiment support cradle 108 is configured with a stop or tube dam at the feed side the tube dam may comprise a roller bearing which partially or fully extends the length of support cradle 108 alternatively the feed side tube dam may comprise a solid shape or any other component or components configured to prevent roller tube 102 and wound up shade material from rolling out of support cradle 108 and or allow or the smooth movement of fabric during operation of trough shade system 100 the feed side tube dam may guide shade material during unrolling further the feed side tube dam may partially or fully prevent roller tube 102 and wound up shade fabric from moving out of support cradle 108 during operation of trough shade system 100 and may assist in keeping roller tube 102 and wound up shade fabric centered in support cradle 108 in one embodiment support cradle 108 is configured with a stop tube dam at the rear side the rear side tube dam may comprise a roller bearing which partially or fully extends the length of support cradle 108 in another embodiment the rear side tube dam may comprise a continuous bearing a moulded shape and the like further the rear side tube.