I have a 2000 Pleasure Way Excel TD. My friend, who was driving in front of me, kicked up a rock and "BAM" broke the little window above the drivers side.
I was able to have a regular vehicle window place replace the window. He came to the house and made a template and had the glass cut. He then came back to install it. It wasn't perfect because the original glass had a bit of a curve to it but, it was good enough.
It lasted a few years before it started to leak. Then, I found an RV window place near Denver called "Resolution Glass". All they do is RVs. They were able to reseal the window and I am good to go now.