Rock Solid Slingers was started by Justin Kooima and Glenn Kooima in Northwest Iowa. We have invested in Conveyor Application Systems' high speed aggregate placement equipment. With our truck mounted slinger we are able to load on site or pick up, deliver, and spread a wide variety of materials with quick turn around time. We have also invested in packing equipment in order to better serve our customers on jobs that require large volumes of packing gravel. We are equipped and willing to take care of an entire project or simply do the placement. Whether it is stone, soil, sand, or mulch we can deliver and place your aggregate in a precise and highly efficient manner. Our goal is to save you time, labor, and money on every job.