Didn't work. Went to my cart page, added the server behavior, can see it in the list. When I run the page it drops the product but not the shipping (as generated by WA_eCart_DisplayMoney($eCart1, $eCart1->GetShipping()). Also, when I go through the checkout process and on the confirm page, clicking on the Modify Information button (which brings me back), I can change any of the info except the shipping. Stays on last value.
I wonder if, because there is a clear cart already on the page, before this one, if the redirect and update make it so that it never reaches the clear session with the second behavior?