There are several gas lines that are run under the tariler body, and are clamped, But they will vibrate and cause wear.
I put the vinal tubing that you can buy at your local Hdwr store that is used to prevent water dripping on your house water lines. I just slip them one and clamp them with tye wraps.
The body underpanels crack and come loose. the answer is to buy some flashing material from a roofer . Cut to size and pop rivet it on.. BUT FIRST..>>get some washers that have rubber grommets on one side , and it will stop the washers from cutting through the panels.