Look on the ends where it's mounted to brackets. It probably has a manufacturer label. Although there's many different styles/brands/sizes of motorhomes, they often use the same components.
My slide topper hardware is Lippert components, same for my awning. IMO, the video posted was very vague... for such a project MUCH greater detail is needed, with specific step by step instructions. This guy "step skipped"... which is fine for someone experienced with doing this.
I'm watching closely because I know I will eventually need to tighten mine in a few years...