Check out Storage and Archiving Steel Racking Systems 3D Model Pack purchase 3D model on CGTrader for $50. High-quality mesh by SonerY.
SKP (Sketchup, filesize: 21 MB), OBJ (OBJ, filesize: 136 MB), 3DS (3D Studio, filesize: 25.5 MB), DAE (Collada, filesize: 51 MB), DWG (AutoCAD, filesize: 93.5 MB)