Review on Maximizing Space with 4Pc Storage Boltless Shelving Capacity: Organize and Store Efficiently by Herthoel Yanda

Looks like an easy addition. However, it is necessary to be able to move the shelves with the load. It's not clear what a 'heavy' load is according to the instructions (maybe it's just a legal precaution), but it will be updated once everything is put together. Update: The whole point of casters on a rack is to be able to move the unit with a load. Not fully stocked with car batteries but I'm happy to report that it works with 3 backup batteries and multiple computers. I had to drill a few holes but I have them on a five shelf storage rack from Sam's and they work great. Lightweight and well-designed stand, these reels fit perfectly (with a small stand setup). Very smooth movement even on slightly uneven concrete basement floors. Very satisfied, worth the price for the bracket and caster design.