Rakers just provide security when they are supported and footed sufficiently; single-tube rakers alone do not generally provide this and require to be braced to prevent buckling. http://pagolworld.com/__media__/js/netsoltrademark.php?d=153.126.169.73%2Fquestion2answer%2Findex.php%3Fqa%3Duser%26qa_1%3Dpowerage7