Hey guys, just bouncing an alternate idea off muh brain.
What do you think of these welded metal work benches as potential stands? They have levelling feet also. Just happened to see these while I was pricing blocks and lumber:
Rated for very heavy loads and have up to 1 1/2 inch thick table tops.
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I've considered similar type workbenches in the past. I think it would hold up great provided the top supported the entire bottom of the tank. If you wanted you could install some shelves between the legs to make it even more sturdy and functional.