Not involved with the vehicle engineering industry but with rellies whom are....their responses to my question as to whether I need add anything like underbody guards to my FJ Cruiser has been....new car and factory protection is enough! I am not going rock climbing but will traverse unsealed roads etc and many will be corrugated and I guess "rough" depending upon weather. Do I need Underbody Protection in addition to Factory standard stuff? Cheers!