From what we gathered, these units should be strong enough to be able to hold at least one of your impossibly heavy cast iron pans. The average size cast iron pan weighs about 8 pounds. Many of the average racks out there on the market have the capability of holding up to 40 pounds. So, as long as you make sure to keep the weight evenly distributed on your unit, you should have no problem storing all of your heavy cast iron gear on one of these devices.