Thanks Jason! We've worked out a solution where we've created our followup pages in our CMS. Next step is to hide/obscure the URL of the followup page. 
	Here's the script if anyone's looking:
	<script src="//app-aba.marketo.com/js/forms2/js/forms2.js">
	<form id="mktoForm_xxxx"> </form>
	<script>
	MktoForms2.loadForm("//app-aba.marketo.com", "xxxx", xxxxx,
	function(form){
	//Add an onSuccess handler
	form.onSuccess(function(values, followUpUrl){
	location.href = "CMS Followup URL";
	return false;
	});
	});
	</script>