Industrial racks will work provided they are strong enough to hold the weight for the period they will be in use. My company used hundreds of metal industrial grade racks (stacked 5 high, or roughly 20 feet high) to hold pallets filled with materials that were far heavier than most large tanks in the 75-125 gallon range.
Contact the manufacturer and confirm the capacity and conditions required and you should be able to determine which racks will work. Make sure they know how the tanks will be placed on the racks, the weight of each tank, and what the flooring will be, and how long the tanks will sit.