Have a steel stand made. It will fit YOUR dimensions that way and cost about the same as a pallet rack.You can even have it designed so you can disassemble it!
Lodi Metal Tech (http://www.lodimetaltech.com/) makes great pallet racks. They have several dealers in the area, one is http://www.avantistorage.com/ at
AVANTI STORAGE SOLUTIONS
14531 Griffith St., San Leandro, CA 94577
Call Us: 510-351-6300
I have a pallet rack I purchased from them years ago to hold 2 290 gallon tanks (72 x 30 x 31). I got a heavy duty unit rated at 8,000 pounds per shelf and 40,000 pounds per pair of uprights.
Have a steel stand made. It will fit YOUR dimensions that way and cost about the same as a pallet rack.You can even have it designed so you can disassemble it!