I built my own rack out of melamine. It fits 14 41qt tubs. I use heat tape and drilled a channel into the shelf for the thermostat probe to fit. Pros include having it designed the way I wanted (dimensions) using the materials I wanted, and cost was lower than a manufactured rack ($100 for supplies to build the rack alone, and another $200 for the heat tape and thermostat). I can only think of one con at the moment: It is one heavy beast of a rack, making it quite immobile. That's ok if you set up the rack where you want it to be, but if you will require being able to move it, building a rack out of melamine may not be a wise idea.
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