It will wobble a bit more then the one they recommend for diesel and bullbar mounting (fibreglass) but the fibreglass have a bad tendency to crack if bent over offroad. The CD900 whip does wobble but not as bad as others i've seen and since it has that thick lower polyurathane section i can't see it breaking off. They are very popular on the exploreoz forum and some of those guys do many miles on rough outback roads. i wouldn't worry about that warning on the web page.