I have 12 of these units. They are the best to store tubs on in your gargage or storage sheds. I brought other storage units and were very disappointed but these shelves can withhold a lot of weight and are easily put together. They are built well; I just wish all shelving came with wheels so you can easily move them around in your gargage.Brought units at Sam's Club and Walmart.The ones at Wal-mart do not have wheels. Please provide all units with wheels. I like to invest in this company.