We used the standard rock guards - they fit all the regular trailers with the pano windows, from the Argosys to the new Airstreams. (Minuet owners have to modify the flat middle guard.) It took Sean & our son Kyle about 2 hours to install them. They weren't cheap, but I like the fact that we don't have to put them on & take them off before & after each trip.
Before that, we tried to make some DIY rock guards using those silver sun shades for cars. We hot glued that thin, flexible foam packing material that comes in sheets to the inside and used silver duct tape to seal the seams. We attached them to the windows with Velcro. They worked fairly well on our first test run last Memorial Day, until one blew off somewhere along the road on the way home.
That's when we decided to get the standard ones.
I think we were very lucky that we towed this trailer for 3 years without rock guards and never had a broken window. I'm glad we finally have them now, though!
Have fun with your new trailer!
Sharon