buy some ply wood and make your own, or look into gorilla shelves, i think they would hold the weight, dont hold me to it tho
i have a still stand that seems a lot sturdier that that one, mine is the same without the fancy s**t in place of legs, it has 4 solid legs, and is steel
if i were you, id look into a wood or steel stand made for two tanks with a rollout bottom platform, with some heavy duty rollers of course