Channel along lenght of motorhome

[<Utah Spraw>]

Howdy, I would like to know what is the purpose of the channel on the drivers side  that runs the lenght of the motorhome above the door and window, Is it factory or did someone add it on , is this for a awning?
Is there any members in Utah ?
Where can I get a owners manual ?
Looking for a rear bumper for a 79 !
Thanks all

[Horst]

Channel along the driver's side?
Could be an awning rail, although that would be unusual.
Does this channel go all the way around your Clipper? If so, it's the panel seam system.

You might want to seriously consider joining the ACOC (our Club) if you haven't already - very little money - very well spent.