The LaSalle Bristol CrossBreeze Adjustable Toy Hauler Screen part # 3441409662PBK which is 96-5/8" wide is made of a fiberglass mesh similar to a window screen but much more durable. It works to shield from UV rays and bugs while also still allowing for fresh air. It also provides a measure of privacy.
Unfortunately, I am not aware of any soft plastic alternatives for trailers. view full answer...