Securing brake lines and fuel lines is very important. If these things flop around under here they could get damaged and worn or caught on a branch or rocks. If they get damaged and you are lucky, your brakes will quit. If you are unlucky and the high-pressure fuel line gets punctured, you could have a huge fire that will continue to get fed nice, fresh, highly flammable gasoline until the wires to the fuel pump get roasted. That means totally dead Jeep, if not passengers. We like securing our lines every two to feet or so with these rubber lined clamps and self-tapping screws.