I got the truck for two days in June to do the build-out construction and pray that everything works the way I thought. I did and it does!!
Here is the fan box installed at the back with the framing for the Peanut Return Ramp:
Unfortunately they didn't give me the picture window glass so I couldn't see the effect in it's full glory. But here is the view through the rear-door window.
And a little bit of what it might be like looking through a big window.
Here's a quicky video taken through the screens,
from inside the front of the truck looking back to the windows.
Just imagine that you are looking the other way and that the
Peanut Return Ramp is all painted nice.