Don't know, but it's an interesting question. If, say, you wanted to borrow about a third of the value of your super, what would the banks' view be? Someone will know.
Well, if you die your super is not covered by your will, because your super doesn't belong to you - it's merely held in trust for you. You have no control over it, and hence cannot direct what happens to it as part of a will. On that basis, I would imagine the bank would say your super cannot function as collateral, because you (as the member) do not have control over it (you cannot sign it over to the bank). And you, as the trustee, do not have unfettered right to it either. Your super assets are in a locked box. You can't just help yourself to it, and neither can the bank.