On my 2805C I have what I think is the Lexan window. Have never tried to verify if it is Lexan or glass. It is a one piece picture window and does not open. On the 2010 classic the window has more of a curve to it and would make it a little more difficult to hinge a rock shield. I think leaving the rock shield off was a cost cutting item tho.

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Jim L & Faye
2805C
2003 Silvarado diesel crew cab
2017 Silvarado, crew cab 1500 6.2L gas w/ 8 speed tranny
central VA

The window does not open and it fits flush to the end cap. It is made of flexible Lexan. Inside is a large shelf below the window, then the day/night shade covers that. One of the dumb ideas they had was to put a light fixture behind the shade which doesn't provide much usable light into the lounge area. We had the trailer a number of days before we discovered the light because of its hiding place. The lights on either side of the front window in the older models were much better.

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My Great Wife Joyce
2018 Jayco Jay Flight 21QB
Formerly owned 1705T and 2310H
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
Amateur Radio K3EXU