Well all CB70 racks I have seen, pull out the long direction. With heat tape in the back this makes it very difficult to use this as a multi size tub rack. If you want interchangable tubs, I would go with 1 cb70 rack and one rack to fit 41 qt sideways or 2 16 qt tubs per shelf. As to dimmensions, I always buy the actual tubs before I start cutting up lumber.
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