You can start here:
https://www.trekwood.com/parts-searc...23+%2F+Keyword Scroll through the multiple pages and you MIGHT find a replacement handle.
Your dealership can (if they want to take the time) order you a replacement. They may even have some in stock from a previous repair.
Alternatively, you could visit Lowe's or Home Depot, look for a "similar style/color handle and then look inside your RV for a "same item handle" that's in an inconspicuous location, install the "similar color/style" handle in the inconspicuous location and move the handle from there to the location where you see it regularly.