If you don't want to take the Scamp
to the shop. Just unmount the window and take the whole window to the glass shop. The glass is held in the frame with the black glass sealing goop. You can pull out the rubber strip from around the window glass and see sealed glass. The glass guy removes the old glass and uses it as a pattern to cut the rounded corners on the new glass. He cleans the frame and glues the new glass in and reinstalls the rubber strips. The best thing to do is to talk to your glass guy.
I figured it would cost that much for a DIY job. Buying a tube of black window goop and wasting several pieces of glass trying to cut the round corners and having to clean up all the broken glass. Took the glass guy about 15 min. to replace the glass in an installed window in one trailer.