I chose Fiberine to do my my top based on overall cosmetic design. I liked the way it blends in with the Econolines body lines.
Fiberines 24 " top is about as aerodynamic as is gets with a high top this size. Their product is good, expensive, and they did my install in about 6 hrs. They even dropped me off down at the beach in Long beach at the Queen Mary and aquarium, and picked me up when the top installation was finished.
The top surface of the 24 inch is not flat. The is a hump in the center that makes it a little tricky if you want to install a rack or solar panels.
2006 e350 EB Quigley V10 Gas Daily Driver
Fiberine 24" high top
Home Build interior, 200w solar, 42 Gal fresh water
46 gal Transferflow tank, Agile RIP kit