While the beams do not support the weight itself, they do distribute it between legs. The beams distribute the weight, the legs support it. Picture it this way, as rodum put it earlier one 4x4 can support 55 gallons of water, roughly 440 lbs, but would you put up a 55 on one 4x4? No, the weight isn't distributed, and you'd have a 4x4 in your basement. Also if you anchor the beams to the legs, but don't have a leg holding the weight, but screw it in, then the weight of the tank is no longer being supported by the legs, but rather the screws or nails used to hold the beams and legs together.rallysman;487581;487581 said:the horizontal beams dont really support much of the weight though do they? I was under the impression that they are there to keep the verticle one (which do support the weight) in place and square.