I agree with above, I had the same exact stand for almost 2years before giving to a friend here on AC. He still uses the same stand w/o the foam or board underneath.
I was scared to death to use the stand like you were also being stress loading it felt so cheap and shaky when the tank was empty. But after being setup it was fairly solid, and I never worried about it for the entire time.
good luck either way. If it really bothers you, piece of mind is priceless go ahead with your board/foam. Doesn't hurt to be over cautious.
