Welcome to the forum! I had the dealership service department installed an awning for the bedroom window on my TT. It only covers the window but it does cut down the heat coming in from the direct sunlight.
You can try your local RV store or CampingWorld.
Great choice for "Living within my means" and camping for one...
2011 Salem Cruise Lite 20RBXL & 2011 Toyota Tundra Dbl Cab
Camping History: 45 Trips / 133 Nights / 3736 Miles
FRF Social Group: Campers of the West