All glass is Prevost. I believe CC at one time etched a design in the side window glass, but the glass itself was part of the chassis.
If the glass you refer to is part of the sliding glass window assembly the glass in the slider and the fixed portion are double wall, and secured in place using Sika-Flex.
If you cannot get a replacement from Prevost at a cost a little less than the national debt you have several options. It is removeable using a sharp utility knife to cut into the Sika-Flex surrounding it, and then inside the frame where the glass is bonded to the frame. With it removed you can go to a local glass installed and they can separate and clean the existing glass and then reseal it, or they can make a new double pane replacement, or you can opt for a relatively thick single pane glass replacement. All need to be automotive quality so if they brake you get hundred of little pebbles of glass as opposed to knife like large pieces.
We have had owners do all three of your options. Some may wish to elaborate.