Hello; There was a thread on this forum recently where a member had cut a portion of a center brace in order to fit a piece of equipment. A picture was posted. Some members suggested adding replacement bracing and others posted doubts about the stand being strong enough with the cutaway portion. Of course there were posts saying to go ahead, it will be fine.
I have noted that if someone starts a thread about such topics with questions like stand strength or can a huge tank be placed on a second floor, at some point posts appear which essentually say to go ahead or it will be fine. Often there will not be enough information, to my mind at least, to make such a determination.
My take on the commercial stands is that the builders are likely not to put material in place if it is not needed. Sad to hear about the loss of a tank.