We also use Reflectix for the rear window and the three upper windows. Another great improvement we made was to sew white "sun-block" material on the window side of all curtains in our Roadtrek. This made a tremendous difference in both hot and cold weather comfort.
As well, we ordered "Skreenz" for both front doors. They allow lots of fresh air, and when using the Fantastic Fan, there's quite a good cooling effect. We rarely use the A/C.
I installed a polarity reversing switch for the Fantastic Fan (although I believe the newer models have this feature). When switched to "reverse", the fan provides lots of cooling especially when preparing a meal. It's an easy job, since the fan uses a DC motor, and when you reverse the polarity of a DC motor, the fan will turn in the opposite direction.
Jerry & Susie
1996 Roadtrek 190 Versatile (Dodge 5.2 L)