Have you tried calling Gulf Stream? Being that it is a 2011, they should be able to tell you where you can buy one.
Not sure what a Visa is, I am just assuming that it is a class C motor home, and they are still manufacturing Class C motor homes.
2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox