You can cash out to a checking account that is linked to your Simple Savings account. To change that funding source to a different checking account, you can do so here https://go.asktrim.com/simple_savings/transfers.
Please note, you can only link checking accounts to Simple Savings (no savings account or other types of accounts).
Once the new checking account has been set up as a funding source, you can continue with automated transfers from the new checking account or withdraw to that account.