Wonderfully sharp-looking Argosy! I love the matching awning and banana wrap (and chairs!)
Somehow I managed to miss your posts about this until now, I think.
For rock guards for the windows, I recommend the route that I've taken after seeing what SmokelessJoe and others did with theirs. We're using removable flexible protectors of Sunbrella canvas with high-density foam in the middle, fastened on with Common Sense fasteners for marine applications.
Mine may even be the same color as yours, it's hard to tell with different cameras and backgrounds.
Advantages are that they preserve the ability to see through our '70s trailers in the rear-view mirror (the smoke-tint 3-piece guard wouldn't show you much) and that they're quickly and easily removable to let light in when using the trailer.