Retractable Screen Doors?

Has anybody installed any type of retractable screen door inside the "RV" doors on their cargo trailers? I have a velcro/magnetic screen that is light, easy, and does a fair job. However, on some of the more bug-infested rivers I camped on this summer, I couldn't keep them out. Furthermore, getting in and out allowed a lot of them in. A side-opening/closing retractable type seems like the answer, and I'm sure somebody here has already thought of it. Any ideas, suggestions, or pictures? It would have to all fit on the wall inside the door way, as there is no place to mount inside the frame of the existing swinging door.