Windshield glass repair/replace is one thing. Fixing the underlying rusted frame is something else. Been there. Not all glass companies can do that sort of work (grinding down the rust, priming, possibly replacing some of the metal.) And if its badly rusted, pulling the windshield to fix the rust can cause the windshield to crack.
When I had mine done, I had to travel to Elkhart. Duncan RV Repair did the work on rebuilding my rusted windshield frame, and then next-door Duncan Systems did the actual glass work.
