Being an owner of a 2310H I don't feel that putting a stone guard on the front window would be of any benefit. The window is further forward than the older design trailers and to have any stones come up from the tow vehicle would be difficult. The window is made from material that is tougher than Plexiglass, it may be Lexan. You probably have a greater chance of having the side windows broken from road debris.
We had a scratch develop on the window from the bottle cover partly because of the design change, and partly due to the redesign of the bottle cover, it tapers wider at the top. Had the cover not been redesigned the scratch probably wouldn't have developed. Hi-Lo replaced the cover with the optional fiberglass cover and replaced the window. They should have caught that at the factory but I think the new bottle cover came around after the trailer had been redesigned.