Depending on where you are now, I'd go to the RV Fog Doctor in Searcy, AR and let them fix it. I don't know the price for an entry door window, but the passenger window was $200, unless it was etched like mine then it was $300 for an additional piece of glass. The driver's window was repaired last month for $300, he said it is usually $400 but I caught it early so it wasn't bad.
I heard there is a guy from Oregon or Washington who repairs them in his coach in the summer and then at Quartzite in the winter.
There are some things I might DIY but working with glass is not one of them.