<https://spacetrailers.com/do-i-need-heavy-duty-gas-cylinders-for-my-trailer/>
<http://schema.org/description>
"Heavy-duty gas cylinders are the struts in your trailer that allow you to lift the canopy of your trailer. They can make it easier to open the canopy."
<https://spacetrailers.com/do-i-need-heavy-duty-gas-cylinders-for-my-trailer/>