In my experience, there are differences in tubs. When I build my racks I use sterilite, which is pretty common and easy to source. Not all places sell the same ones though. There are at least two 28qt tubs with different model numbers. In my racks, the tubs that you can buy at Target and Home Depot fit. The tubs from Walmart do not, even though they are 28qt! It might be worth picking up one of each and trying them. It could save a lot of aggravation.
Dave
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