Awning rail advice

Hi there,

I am buying a drive away awning ([You must be registered and logged in to see this link.]) and want to attach it to my Trident using an awning rail. There isn’t much info and videos for high top awning fittings but I think I need a C channel and I believe this can be attached to the high to section of my van.

I would be really grateful if someone out there can confirm this, share an example and or correct me if I am mistaken.

Many thanks

Ben