The "frameless window" is held in place with about 20-30 screws through a flange fitting on the inside of the trailer window opening that matches up with the "frame of the frameless window" on the outside of the trailer. You can remove the window from the trailer, cover the opening with plastic sheeting taped in place (DO NOT USE DUCK TAPE !!!) and then deliver the frame to a local window shop. They won't need the entire trailer to replace the glass as long as they have the window frame.... Their "first step" in replacing the broken glass would be to remove the frame from the window opening, so you're just helping them with their first step.....
Alternatively, the window is probably manufactured by Lippert. You can contact them through their website
https://www.rvglass.com/ or call the "main Lippert customer support section at this link:
https://store.lci1.com/contact-us The link will give you information to do a "web chat" an "email" or the phone number is on the link if you want to speak to a CS rep on the phone.