Side glass replacement

Try RV Glass Solutions -- Their main office is in Coburg Oregon, but they say they have installers nation wide. You can do a google and find their number.
They replaced a side window in my trailer last summer and they were super in their service and installation.

If you're willing to drive a bit, maybe give Burlington Glass (in Vermont) a call. I don't know if they specifically deal with frameless RV windows, but I do know they do a lot of somewhat specialized custom work and also auto glass, and (at least for the windshields I've had to have replaced over the years) have done the work well.

You might also try bringing the RV in to a decent local glass shop and letting them examine the mounting. Maybe they're familiar with the technology, but just not the nomenclature of "frameless window."

You might give these folks a call- http://www.duncansys.com/rvsideglass.